Are you on a boat? Out of Road Town? If so, I'd just hit Norman, Peter, and Cooper -- all three are great stops. Snorkel the Indians on the way to Norman if you get there early - hit the Caves as well and then pick up a mooring in the Bight. Head to Peter the next day and maybe anchor in Deadmans Bay and enjoy the facilities ashore at Peter Island Beach Resort. On your last day, sail to Cooper and snorkel Cistern. Just my thoughts but others may chime in with different ideas.