ONBOARD diving is the best choice if you plan to scuba dive from the yacht: Your Captain and you will choose the dive site - you sail up to the site - hook up to a mooring ball - dive in some of the world's best diving waters, and when you're done you climb back aboard your yacht to be met by the chef with a most welcome snack. Also great is rendezvous diving, offered by almost all the yachts, where arrangements are made with a local dive shop to meet your yacht. Diving is then done from the dive shop boat with their group. You are returned to your yacht at the end of the dive. If some of your party would like to dive, but they are not certified divers, this can either be done onboard from a boat with a certified dive instructor, or by arrangement with a local dive shop.
Almost all the crews will teach you essential sailing skills and key concepts and let you help man the helm and hoist the mainsail - you can learn as much or as little as you want. If you are serious about learning to sail and want to get ASA Certified on your vacation, there are a select few boats which can do just that.