If you'd like to see more of the Everglades than an airboat tour has to offer; if you like kayaking, hiking, photography, and/or flora and fauna; and if you want a really memorable way to spend the day, invest in a tour with Garl's. It's a premium excursion but worth every penny. Garl and his expert guides will take you off the park roads and into Garl's favorite spots and personal trails. We were there during the wet season (June), after tropical storm Andrea. Our adventure began with a hike into a gator hole (which is not as scary as the name suggests—we didn't actually see any). Thanks to the season and recent rain, it was completely flooded (at other times of the year, Garl explained, it was relatively dry)--our hike was a wade through perfectly clear, warm water that averaged knee to thigh deep. In the shade of the trees, this was surprisingly cool and pleasant, but quick-dry clothes (long sleeves and pants), sport sandals or water shoes (the latter of which Garl can supply), and lots of insect repellant are a must. Garl also has “bug suits” available. Garl told us about the gator hole's ecology and pointed out wildlife, including a barred owl. He also shared some of his personal adventures. Next, we headed to 9 Mile Pond for a freshwater paddled through the mangroves, stopping periodically to observe wildlife, especially birds. For the kayaking portion of the tour, we used sit-atop kayaks. Garl was very patient with our relative inexperience and gave us some good paddling tips (which still didn't prevent us from smacking into things, getting wet, or accidentally flinging bladderwort onto ourselves, but he was nice about that too). Although part of the paddle followed official park “trails,” Garl guided us along his own favorite paths as well, allowing us to see areas many visitors do not. Finally, we drove out to Flamingo to check out reports of manatees at the marina. Unfortunately they had moved on, but we saw wildlife including a ~7 foot long crocodile, an osprey, and a coot. (Beware the deer flies, though!)
Garl and his staff will tailor your excursion to your skill level and interests, so not all tours are alike—some do more than one hike and/or more than one paddle, and locations may vary due to weather conditions (for example, we passed on a saltwater paddle because the wind was too strong). Garl and his guides routinely take pictures of you and the things you see on your trip.
In addition to insect repellant and the right clothes, you should definitely bring water, sunscreen, a snack, and a camp towel. Consider bringing a small dry bag or dry box to protect your phone, camera, etc. when not in use. There are bathrooms at the Everglades visitors center, so you could potentially change clothes.
This is a long, physically-active trip, so if you have any health or endurance concerns, you should speak to Garl and his staff before booking.