The Indian River is not really a river at all, but a large, brackish lagoon that's home to a greater variety of species than any other estuary in North America -- it has thousands of species of plants, animals, fish, and birds, including 36 species on the endangered list. The privately funded Environmental Learning Center was created to educate visitors about the Indian River area's environment. Situated on 51 island acres, the center features a 600-foot boardwalk through the mangroves and dozens of hands-on exhibits that are geared to both children and adults. There are touch tanks, exhibits, and microscopes for viewing the smallest sea life up close. The best thing to do is join one of the center's field excursion programs, from guided nature walks and stargazing to river cruise adventures. Prices range from free to $50 depending on the program.