Biscayne National ParkLocation: South Florida
Known for: Mangrove forests, keys, and coral reefs.
Biggest crowds: Seldom crowded; visit between December and April to avoid mosquitoes.
Accessibility: Because so much of the park is underwater, you won't see much without a boat or a guide.
Why kids like it: A diverse population of colorful fish can be seen in glass-bottom-boats and while snorkeling.
What hikers say: Diving and snorkeling are a must to appreciate the park fully.
Best for:
Everglades National ParkLocation: South Florida
Known for: Gator-spotting, swamps, and various kinds of aquatic sightseeing.
Biggest crowds: Winter, during the dry season. The park is on a skeleton crew during Summer (wet) months.
Accessibility: Although there is one main park road, the best way to experience the park is to get your feet wet.
Why kids like it: Gators!
What hikers say: Take a "slough slog" through the muck, paddle a canoe, or take advantage of one of the numerous tours.
Best for:Visit the Travel Talk forums for help on planning your trip