Have you thought about building an RC Landsailer lately? The hobby is still in its growth stage but has advanced quite a bit in the last few years. They now have several sources for models and kits. There are also sources for plans to build your own and for parts useful for designing your own. IRCSSA, the international coordinating body has a website WWW.IRCSSA.ORG
and has even established a unique program in which RC Surface sailors can compete with other RC Surface sailors in distant parts of the world without having to travel out of town.
By the way, IRCSSA stands for International Remote Controlled Surface Sailers Association. A surface sailer is either a landsailer or an iceboat. And there are at this time members on every continent except Antarctica and Asia.