1. Puerto Rico
One of the coolest things you can do in Puerto Rico is visit La Parguera, a bioluminescent bay where you can swim in glow-in-the-dark waters.
2. St. Thomas
St. Thomas has the most shopping opportunities of the islands and it is a great place to purchase items duty-free.
3. St. Croix
St. Croix has its own unique culture and offers many activities, and of course, it has beautiful beaches.
4. St. John
For those looking to experience nature and spend time adventuring, this is the island for you. This is one of the best places to snorkel in the Caribbean.
Located in the Pacific Ocean, the tropical island of Guam is another U.S. Territory, so it is a great tropical vacation you can take without a passport.