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 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; reservations required). These are popular, so reserve in advance. Ride a "bottomless" boat to see what's below the waves and take a guided tour of the marine-life exhibits. Nonstop animal shows highlight conservation issues. You can stop for lunch at the grill, shop in the extensive gift shop, or sunbathe and swim at their private beach. This easily could be an all-day attraction.