The Ultimate Land Yacht Castagna recently debuted the Tender for land cruising: an open-air cabriolet with a 30-liter freshwater tank with shower and a 2000W Clarion audio system and extra spotlights (for beach parties). The striped soft top is by Missoni, while the interior has neoprene-covered seats to stand up to sun and saltwater. Lifting rings at each corner make it easy to sling the car aboard. You have to buy the Mini Cooper (starting at $17,450) first, and then figure about $25,000 for the custom conversion. www.castagnamilano.com