Both of the above will be a zoo and it's a long, long day trip to fruitsville. Key Biscayne just south of downtown Midam... Crandon Park for swimming and the Cape Florida lighthouse.
Markham Park just west of Ft. Lauderdale in Sunrise. http://www.broward.org/parks/markhampark/Pages/Default.aspx Great place to Camp inside a beautiful park right next to the Everglades while you check out the area.