We just booked Miami for the week of Christmas. We're taking our 5 year old and it will be her first time ever in Florida. We're staying in Hollywood, FL.
Plan so far is (1) spend Day 1 at the beach, (2) spend Day 2 at a zoo or zoo-like attraction - right now we're looking at Flamingo Gardens since it is fairly close to where we're staying, (3) spend Day 3 doing a hovercraft tour of the Everglades, and (4) take a fishing trip on Day 4 - we found a guy on Airbnb who leads fishing trips in the canals south of Miami and claims he's very kid-friendly.
Happy to take any and all suggestions on kid-friendly things to do in South Florida. We all love animals and we'd also be interested in going somewhere where we can just see iguanas, tegus, and other large invasive lizards. That would be a huge treat for all three of us.