Inflatable...
These work very well and are easy to store when trailering or sailing. Can be towed inflated, too. They come in all shapes, sizes and price ranges: Plastic pool toys to Hypalon; and come in Kayaks (sp?) as well as more traditional shapes.I have used a cheaper plastic one, then went to a BoatUS Hypalon for a more secure platform . The next year I bought a motor as these things are hard to row in blow or current. Other portable options to think about are a rigid kayak and fold-a-boat(http://foldaboat.com/).Fair winds... Tom