My husband and I just returned from a week long Keys vacation. Our trip with Garl to the Everglades was one of the most fun, interesting, and totally different things we did on our trip. Garl is a naturalist, he literally walks around the everglades without shoes...which at first made me worried because he insisted that everyone wear long pants and long sleeve shirts for the tour...but he was right, of course. Had I trekked to gator holes in my shorts and tank top I would have been cut by razor grass and eaten alive by mosquitos. If you go, bring some lightweight pants and longsleeves to wear. And don't bother with a bathing suit - you're probably better off with some good activewear - you'll get a little wet while kayaking, but not "bathing suit" wet. You will see all kinds of cool plants, birds, trees, marine life, and reptiles on this trip. We actually went during a drought and Garl was upset that we didn't get to see any snakes...until we were leaving the park and he saw one crossing the road...so he immediately pulled the car over so we could see the "largest king snake" he's seen in the glades. Really, if you want to see the Everglades, see them with Garl. You won't regret it!
*You will return to Key Largo relatively late (we got back around 10:00 PM on a Sunday). We had eaten a late lunch in the park at a cafe, but when we returned to Key Largo, we wanted some dinner. Because of the day and time, we didn't have many options for dinner, so I would suggest having something prepped earlier or plan on eating Wendy's or some other fast food. Generally, I try not to eat fast food while on vacation, but we had to break our rule that night. No biggie, just a head's up.