Fodor's Expert Review Crystal River National Wildlife Refuge

This is a U.S. Fish and Wildlife Service sanctuary for the manatee. Kings Bay, around which manatees congregate in winter (generally from November to March), feeds crystal clear water into the river at 72°F year-round. This is one of the sure-bet places to see manatees in winter since hundreds congregate near this 90-acre refuge. The small visitor center has displays about the manatee and other refuge inhabitants.

If you want to get an even closer look at these gentle giants, several dive companies provide opportunities for you to swim among them—if you don't mind shelling out some extra cash, donning a wet suit, and adhering to some strict interaction guidelines. In warmer months, when most manatees scatter, the main spring is fun for a swim or scuba diving.