Ed and Molly Buckley's dive shop, called SCUBA (St. Croix Ultimate Bluewater Adventure) is a great one-stop place to get all your watersports needs met. They have a comprehensive website at St. Croix SCUBA which details all of their services in addition to loads of non-diving information about St. Croix. SCUBA is a PADI affiliated shop and offers a great Discover Scuba course which is reasonably priced and has you in the pool in the morning and diving in the afternoon.