COEUR d'ALENE – When Ironman USA comes to town on Sunday, Greg Guillet and his son, Nathan, will be sitting around a campfire in the Idaho Panhandle National Forests. Their house near Tubbs Hill, however, will be abuzz with athletes. Strangers will sleep in their beds, whip up high-protein pre-race dinners in their kitchen and relax on their couch. For a rental income of $250 per night, Greg Guillet is willing to trade the comforts of home for three nights in a tent.