8 Best Sights in The Florida Keys, Florida

This nonprofit focuses on marine mammal conservation, and you can help it by participating in one of the educational offerings. One popular option is the Connect to Protect, an immersive water program that begins with an educational briefing, after which you enter the deep-water lagoon to interact with the dolphins. Prefer to stay mostly dry? Opt for the tour of the facility or the general admission, which provides unlimited viewing of the dolphin lagoons, trainer talks, and educational exhibits.

American crocodiles, mangrove cuckoos, white-crowned pigeons, mahogany mistletoe, wild cotton, and 100 other rare critters and plants inhabit these 2,400 acres, between Crocodile Lake National Wildlife Refuge and the waters of Pennekamp Coral Reef State Park. The park is also a user-friendly place to explore the largest remaining stand of the vast West Indian tropical hardwood hammock and mangrove wetland that once covered most of the Keys.

Hawks Cay Resort's Dolphin Connection offers three programs, including Dockside Dolphins, a 30-minute encounter from the dry training docks; Dolphin Discovery, an in-water program that lasts about 45 minutes and lets you kiss, touch, and feed the dolphins; and Trainer for a Day, a three-hour session with the animal training team.

The 1963 movie Flipper popularized the notion of humans interacting with dolphins, and Milton Santini, the film's creator, opened this center, which is home to a colony of dolphins and sea lions. The nonprofit center has educational sessions and programs that allow you to greet the dolphins from dry land or play with them in their watery habitat. You can even paint a T-shirt with a dolphin—you pick the paint, the dolphin "designs" your shirt.

Programs begin with a get-acquainted session beneath a tiki hut. After that, you slip into the water for some frolicking with your new dolphin pals. Options range from a shallow-water swim to a hands-on structured swim with a dolphin. You can also shadow a trainer—it's $350 for a half day or a hefty $630 for a full day.

There's much to like about this 5-acre island under the Old Seven Mile Bridge. You might even recognize it from a season finale of the TV show The Amazing Race. You can reach it via a restored train that departs from the gift shop, which is in a trailer at Mile Marker 47.5. Once there, tour the island on your own, or join a guided tour to explore the buildings that formed the early-20th-century work camp for the Overseas Railroad, which linked the mainland to Key West in 1912. Later, the island became a fish camp, a state park, and then government-administration headquarters. Exhibits in a small museum recall the history of the Keys, the railroad, and railroad baron Henry M. Flagler. The train ride with tour lasts two hours. Bring your own snorkel gear and dive flag and you can snorkel right from the shore; pack a picnic lunch, too.

Possibly the most photographed site in Key West (even though the actual geographic southernmost point in the continental United States lies across the bay on a naval base, where you see a satellite dish), this is a must-see. Have your picture taken next to the big striped buoy that's been marking the southernmost point in the continental United States since 1983. A plaque next to it honors Cubans who lost their lives trying to escape to America, and other signs tell Key West history.

The second-oldest marine-mammal center in the world doesn't attempt to compete with more modern, more expensive parks. Even so, it's among the better attractions north of Key West, especially if you have kids in tow. In addition to seeing marine-life exhibits and shows, you can make reservations for up-close-and-personal encounters like a swim with a dolphin or sea lion or stingray and turtle feedings (which include general admission). Stop for lunch at the grill, shop in the extensive gift shop, or sunbathe and swim at the private beach.