My favorite gadget was the Jupiter foldable electric bike, maybe I just like all the colors it comes in, but how great to have a bike that small to check out a town or island as you are cruising. My runner up is a very cool inflatable platform you could use off your boat, for added space or off your dock, made by Solstice…its primary purpose is to enable huge yachts to deploy more of their toys – jet skis, paddle boards etc for charter guests. [links]