LAS VEGAS -- There's lazy, and then there's Las Vegas lazy. In increasing numbers, Las Vegas tourists exhausted by the four miles of gluttony laid out before them are getting around on electric "mobility scooters." Don't think trendy Vespa motorbikes. Think updated wheelchairs. Forking over about $40 a day and their pride, apparently healthy tourists are cruising around Las Vegas casinos in transportation intended for the infirm. You don't have to take a step. You don't even have to put your drink down. "It was all the walking," 27-year-old Simon Lezama said on his red Merits Pioneer 3. Lezama, a...