Everglades Safari Park - it is a huge natural park that takes up to a quarter (!) of the southern Florida state - there are severe tropical forests, gloomy mangroves along the coastline and quite unfriendly swamps covered with barbed saw grass.
Only a few people know that there are many water parks within a radius of 40 minutes drive from Miami! And you do not need to go wearily for 4 hours to Orlando in the heat. Among others, Google will give you a website of the Broward County in a search with information about this water park, reviews in English and a confident 4.5 star rating!
Flamingo Gardens - it is a green island of a shady tropical forest in the middle of a hot metropolis. If you come to Miami, do not be too lazy to get to this unique botanic garden, where the largest trees in Florida grow and not only hundreds of flamingos live, but also many other amazing birds and animals.