Sitting around for a week? Might as well do it on a beach and you have numerous options within 1 hour of ONT, especially once you figure out the traffic patterns. Take the 10W-71S via Fairplex south, to the 91W. Pay the small toll on the 241 towards the beaches and grab a place somewhere in Orange County.

If you are younger you might enjoy either Claremont or Fullerton as they are college towns and offer plenty of night time options.