NorCal Jump keeps kids not only active, but airborne. The company rents out a regularly updated supply of rainbow-hued bounce houses, which can each hold up to 10 leaping youngsters or Venus de Milos. The play structures range from standard models adorned with decorative banners of cartoon characters to a more elaborate style with an actual inflatable Spiderman on its roof. In select houses, tots can slip down inflatable slides, dart through obstacle courses, and dunk on kid-sized basketball hoops. A team of trained staffers delivers and sets up each house and can bring along selections from the business’s supply of waterslides and cotton-candy machines.