A private jet, 'backyard stadium' and a $62M tree house: The gift guide strictly for billionaires who have been VERY good this year

Robb Report's 2013 gift guide includes a $92million mega yacht with a 2,300-square-foot sundeck and glass-bottom pool (top left); a one-of-a-kind, triple-complication wristwatch from De Bethune worth $1.1 million (bottom left); a $62million tree house (center); a $30million 100-seat 'backyard stadium' (top right) and a $83million Sky Yacht custom private jet (bottom right).