Day trips

 
A great way to explore neighboring islands is to take a ferry over to the BVIs (ferries go to Tortola, Virgin Gorda, Jost Van Dyke and Anegada).  You can leave from St. John and visit Tortola easily.  Or you can hop over to St. Thomas on the local ferry from Cruz Bay, and then take a small plane to other islands.  Planes depart the St. Thomas airport regularly, and you can charter one as well.