Orlando has anything you want. Make sure you go to:
If you are going to spend $15.00 on a hamburger this is the place.
You can go to Silver Glen in Lake George cool place to hang out nice springs and fresh water. Put in at Astor and it will save you the manatee zones although the first time up the river you may not mind them, very pretty wildlife, so you could put in down river a little more south. Look at a map it's the St. Johns River. If you like fishing there is a campground at East Lake Fish camp (east lake Tohopekaliga) that rents cottages and have boat slips. look it up on the map close to all the tourist stuff and probable good rates. Check to see if any Space Shuttles are going off while your here. Awesome to see and feel in person.
The Keys depends on how much you want to see but for the money Key Largo is nice some good dive sites. Or try Holiday Isle always had a good time there. And it's not to far down the keys. How old are you kids. You can swim with the dolphins in the keys at a couple different places. You can go to Hawks Cay and swim with the dolfins without staying there. But our freinds just went there and their boy wasn't tall enough. Enjoy yourself. E-mail me if you have any questions.