Have you been to the Florida Keys?

From Miami to Key Largo is about 1-1 1/2 hrs. Your best bet is to stay at a smaller hotel in the keys and save time and gas money. The bigger resorts are really pricey but you can utilize the nightclubs,bars and restaurants in them.Whale Harbor has a nice seafood buffet in Islamorada, a little expensive but lots of fresh seafood and you can walk along the docks and see the fishing charter boats. Kelly's Motel in Key Largo is pretty decent but nothing fancy. For snorkleing find a boat that goes to the Christ statue. Can be crowded but the reefs are worth it.