You are spoilt for choice over there you really are. Were you looking for recomendations for FBO's in the MIA area or would you go further afield? Florida Institute of Technology (FIT Aviation) based at Melbourne international rent out their 152's for $55 per hour including your fuel. Good place IMHO.
As for places to fly to: The Keys is a good one, Pahokee down by Lake Okeechobe was a favourite for me, Gainsville a little further north (get an ATC vector right over MCO!), Jacksonville but if you really wanna go silly fly all the way up the east coast like I did - great views and great airports but make sure the wx all the way up is good as you wouldn't want to get snookered!
VFE.