The United States is home to some truly massive islands, each offering its own mix of natural beauty, wildlife, history, and adventure. From icy wilderness in Alaska to tropical beaches in Hawaii, these islands are more than just dots on a map — they are destinations that leave a lasting impression on travelers. If you’re planning your next getaway and want something beyond the usual tourist spots, these largest islands in the USA deserve a place on your travel bucket list.
1. Hawaii Island (The Big Island)
The largest island in the United States is the Big Island of Hawaii, officially known as Hawaii Island. Covering more than 4,000 square miles, this island feels like several destinations combined into one.
What makes the Big Island special is its incredible variety of landscapes. In one day, you can relax on a white-sand beach, explore lava fields, hike through rainforests, and even see snow on mountain peaks during winter.
Things to Do
- Visit Hawaiʻi Volcanoes National Park to witness active volcanoes and dramatic lava landscapes.
- Watch the sunrise from Mauna Kea, one of the tallest mountains on Earth when measured from the ocean floor.
- Explore black-sand beaches like Punaluʻu Beach.
- Go snorkeling with sea turtles along the Kona Coast.
- Visit waterfalls near Hilo, including Rainbow Falls and Akaka Falls.
- Best Time to Visit: The island is great year-round, but April to October usually offers the best weather for outdoor activities.
- Travelers Love: The Big Island feels raw and untouched compared to some heavily developed tourist destinations. Many visitors love the slower pace, local Hawaiian culture, fresh seafood, and endless outdoor adventures.
2. Kodiak Island
Located off the southern coast of Alaska, Kodiak Island is the second-largest island in the United States. It is famous for rugged wilderness, incredible wildlife, and some of the best fishing opportunities in North America.
This island is ideal for travelers who enjoy nature, solitude, and outdoor adventure rather than crowded attractions.
Things to Do
- Visit Kodiak National Wildlife Refuge to see the world-famous Kodiak brown bears.
- Go salmon fishing or halibut fishing with local guides.
- Explore scenic hiking trails with mountain and ocean views.
- Discover the island’s Russian history and local museums.
- Take wildlife cruises to spot whales, sea otters, puffins, and eagles.
- Best Time to Visit: Summer, especially June through August, is the most popular season because of mild weather and excellent wildlife viewing.
- Travelers Love: Kodiak Island offers a true Alaskan experience. The scenery is dramatic, the wildlife is unforgettable, and the peaceful atmosphere attracts travelers looking to disconnect from busy city life.
3. Puerto Rico
Puerto Rico is the third-largest island connected to the United States and one of the most exciting Caribbean destinations for travelers. As a U.S. territory, American travelers do not need a passport to visit from the mainland United States.
Puerto Rico combines tropical beaches, rich culture, historic cities, rainforest adventures, and amazing food in one destination.
Things to Do
- Walk through the colorful streets of Old San Juan.
- Explore El Yunque National Forest, the only tropical rainforest in the U.S. National Forest System.
- Swim in crystal-clear Caribbean waters.
- Visit one of the island’s glowing bioluminescent bays.
- Enjoy authentic Puerto Rican dishes like mofongo and lechón
- Best Time to Visit: December through April is considered the best travel season due to pleasant weather and lower humidity
- Why Travelers Love It: Puerto Rico offers the perfect combination of culture, beaches, history, and adventure. Travelers also appreciate the convenience of visiting without international travel requirements for U.S. citizens.
4. Long Island
Long Island is one of the most famous islands in the United States and stretches more than 100 miles along the Atlantic Ocean. Located beside New York City, it offers a mix of beaches, small coastal towns, wineries, and luxury vacation spots.
Many travelers visit Long Island for relaxing weekend trips, seafood restaurants, and scenic ocean views.
Things to Do
- Visit Montauk Point Lighthouse, one of the oldest lighthouses in America.
- Spend time at the beaches in the Hamptons.
- Explore North Fork vineyards and local wineries.
- Try fresh lobster rolls and seafood by the waterfront.
- Visit Jones Beach for concerts and summer events.
- Best Time to Visit: Late spring through early fall is the ideal time for beaches and outdoor activities.
- Why Travelers Love It: Long Island offers a perfect balance between relaxing beach life and access to New York City. Travelers enjoy the coastal atmosphere without going too far from urban attractions.
5. Maui
Maui is often considered one of the most beautiful islands in the world. Known for its luxury resorts, tropical scenery, and famous coastal drives, Maui attracts millions of travelers every year.
The island is perfect for couples, families, and adventure lovers alike.
Things to Do
- Drive the scenic Road to Hana.
- Watch sunrise from Haleakalā National Park.
- Go whale watching during winter months.
- Relax on Ka’anapali Beach.
- Snorkel at Molokini Crater.
- Best Time to Visit: April through May and September through November usually provide fewer crowds and pleasant weather.
- Why Travelers Love It: Maui combines luxury, adventure, and natural beauty in a way few destinations can match. Visitors often return because of the island’s peaceful atmosphere and unforgettable scenery.
6. Prince of Wales Island
Prince of Wales Island is one of Alaska’s hidden gems. Covered with dense forests, lakes, and rugged coastlines, it is a dream destination for travelers who enjoy nature and outdoor exploration.
Unlike crowded tourist islands, this island offers quiet landscapes and authentic Alaskan culture.
Things to Do
- Explore caves and forest hiking trails.
- Go kayaking along scenic coastal waters.
- Enjoy world-class salmon fishing.
- Visit small Native Alaskan communities.
- Watch for bald eagles, deer, and whales.
- Best Time to Visit: Summer is the best season because of longer daylight hours and milder temperatures.
- Travelers: Prince of Wales Island is perfect for travelers who want peace, wilderness, and authentic outdoor experiences away from busy tourist destinations.
7. Unimak Island
Unimak Island is the largest of the Aleutian Islands chain and one of the most remote places in the United States. It is located in southwestern Alaska and is known for its dramatic volcanic landscapes and untouched wilderness.
This island is not a typical tourist destination, but it is highly valued by researchers, wildlife enthusiasts, and adventure travelers.
Things to Know
- Home to the active volcano Mount Shishaldin, one of the most perfectly shaped volcanoes in the world.
- Rich in marine life including seals, sea otters, and whales.
- Extremely remote with no major towns or developed tourism infrastructure.
- Popular for scientific research and extreme wilderness exploration.
- Best Time to Visit: Late spring to early fall offers slightly milder weather, but conditions remain unpredictable year-round.
- Stands Out: Unimak Island is for true wilderness lovers. It represents raw nature at its most powerful—volcanoes, ocean storms, and untouched landscapes all in one place.
8. St. Lawrence Island
St. Lawrence Island sits in the Bering Sea, closer to Russia than mainland Alaska. It is one of the most culturally unique and remote inhabited islands in the United States.
The island is mainly home to Yupik communities who have lived there for thousands of years, maintaining a strong cultural heritage connected to the sea.
Things to Know
- Traditional Yupik villages such as Gambell and Savoonga.
- Rich marine wildlife including walrus, seals, and migratory birds.
- Harsh Arctic climate with long winters and short summers.
- Limited access—mostly reachable by small plane.
- Best Time to Visit: Summer (June–August) is the only practical travel window due to weather conditions.
- St. Lawrence Island offers a rare look into Arctic life and indigenous culture, far removed from modern tourism.
9. Admiralty Island
Admiralty Island is one of Alaska’s most wildlife-rich islands and is often called the “Fortress of the Bears” because of its extremely high population of brown bears.
Located in Southeast Alaska, it is part of the Tongass National Forest and offers pristine wilderness experiences.
Things to Know
- Known as the “Fortress of the Bears” due to one of the highest brown bear densities in the world.
- Protected under the Kootznoowoo Wilderness.
- Excellent kayaking, fishing, and wildlife photography opportunities.
- Home to bald eagles, wolves, and salmon-rich rivers.
- Best Time to Visit: June through September is best for wildlife viewing and outdoor activities.
- Admiralty Island is a paradise for wildlife lovers. The combination of dense forests, salmon streams, and large bear populations makes it one of Alaska’s most unique natural destinations.
10. Baranof Island
Baranof Island is one of the most beautiful and dramatic islands in Southeast Alaska. It is part of the Alexander Archipelago and is known for its deep fjords, dense rainforests, snowy peaks, and rich wildlife. The island is also home to the historic city of Sitka, which adds cultural and historical value to its natural beauty.
Unlike more commercial travel destinations, Baranof Island feels wild, peaceful, and untouched—perfect for travelers who want real Alaska experiences.
Things to Know
- Covered in lush temperate rainforest with mountains rising directly from the sea.
- Strong wildlife presence including brown bears, bald eagles, and whales offshore.
- Sitka offers Russian-era history, museums, and coastal charm.
- Popular activities include kayaking through fjords, hiking, and fishing.
- Best Time to Visit: May through September is ideal for milder weather and easier access to outdoor activities.
- Baranof Island is where ocean, rainforest, and mountains meet in one place. It’s less touristy than many destinations, making it perfect for travelers who want raw nature, silence, and stunning scenery without crowds.
Frequently Asked Questions (FAQ)
Which is the largest island in the USA?
- Hawaii Island, also called the Big Island, is the largest island in the United States.
What is the best island for nature lovers?
- Kodiak Island and Admiralty Island are perfect for wildlife and wilderness experiences.
Do I need a passport to visit Puerto Rico?
- U.S. citizens do not need a passport to travel to Puerto Rico from the mainland United States.
Which island has the best beaches?
- Maui and Long Island are famous for beautiful beaches and coastal views.
What is the best time to visit these islands?
- Summer and early fall are generally the best seasons for most U.S. islands because of pleasant weather and outdoor activities.
Hi, I’m Rasel Miah, the creator of Ultimate Travel Diary. I enjoy exploring travel destinations, hotels, local food, and hidden gems across the USA and beyond. Through this blog, I share travel guides, hotel reviews, and helpful tips based on personal research and experience to help travelers plan better trips.