MARGATE, N.J. - He's a diehard surfer, an eccentric millionaire, a sun-seeking recluse. Given all that, Ron DiMenna's choice of retirement home makes perfect sense.Who else would spend $500,000 to buy an RV, equip it with a slew of high-tech electronic features, paint it to look like a 21st-century woodie and then hit the road, destinations unknown?But DiMenna, the 66-year-old founder of Cocoa Beach, Fla.-based Ron Jon Surf Shops, is not the retiring type. He has three shops in Florida - Cocoa Beach, Orlando and Sunrise.More than 40 years after he started selling boards on nearby Long Beach Island, the...