Oh yeah, I forgot. You will be on the west coast. The absolutely best thing I have ever done on vacation was to swim with manatees at Crystal River, which is maybe 3 hours north on the coast. This is the only area in the country where you can legally swim with manatees. in fact, if you try to touch one anywhere else in FL, you can get arrested.
Costs about $45 a person. They take you out in small boats (capacity maybe 14) and equip you with snorkel gear, teach you what to do and not to do -- they are very strict on rules, and bring you where there are likely to be manatees. We had a record-setting day when I went. For some reason, the more social manatees wanted to hang out with people. Unlike swimming with dolphins (which this is nothing like) the manatees, not you, control the action. I had manatees nuzzling me for a good half hour. No guarantees that manatees will come to you, but it's almost impossible not to see some up close. If this sounds interesting, let me know and I'll get you the name of the tour company I used, which I swear by.
If you just want t see manatees, there is a place south of Tampa where the utility has opened a park . If you want that, I'll get you the name.