If you're in the Miami area, Shark Valley is a great introduction to Everglades National Park (park entrance fee, $10/vehicle). Located 25 miles west of the Florida Turnpike, the Shark Valley Visitor Center offers educational displays including a short informational video, gift shop, nature trails, snacks, and restrooms. Tram tours ($23 per person, $19/seniors, $12.75/children) to the observation tower and back (about two hours) are provided, or rent a bike ($9/per hour) and do the 15-mile loop at your own pace.
At any given time, visitors can see a variety of birds, plants, and even a few alligators, as you'll see in the photos, below.
If you're interested in camping in Everglades National Park, you can find more information here.
All photos © Kelly Beard, The Riveted Roost.