Can you boat in your backyard? Mike O’Brien can. He’s just one of many New Englanders who find a lot to like about living on a lake. Tonight we check out the variety of choices, from cabins to mansions. And we meet The Lake Guy, who’s made a second career out of matching homeowners with the waterfront properties of their dreams, and The Muck Guy, who checks out the bottom of the lake before new owners sign on the dotted line.