1x13 - Joan of Arcadia

At Helen's insistance, she and Will take a getaway to a spa, but all does not go well when Will cannot forget about his job. And with the parents away, the kids are up to a little recreation of their own; Kevin and his boss, Rebecca, find it hard to ignore their mutual attraction; Joan, as she is trying to sort out her feelings for Adam, is instructed by God to throw a party while her parents are way; Luke helps Joan pull off a successful party.