If you do want to go biking, there's a bike path that runs pretty much the length of the keys (I know from Key Largo to Islamorada) alongside Highway 1. The best local fish would be at Calypsos, across from the Fisheries at MM100. The Fish House is good for tourists but the prices are kind of high (nice for a "nice" meal, though). Also, there are several fishing charters. Pennecamp has an entrance fee of $5 per car. I worked at Silent World Dive Center for about eight months last year-if you're still looking for a Dive Shop- their package prices are the lowest if you have your own equipment (less than $40 for a two tank boat dive).