Biscayne National Park: Florida
Aquatic adventurers will favor a trip to Biscayne National Park, where 95 percent of the surface is covered by water. With glass-bottom boat trips, island excursions, snorkeling, canoeing, and more, little ones will love exploring the region's marine life. It's home to some 500 species of fish, plus manatees, birds, crocodiles, and more.
Source: NPS South Florida/Caribbean Network