It’s about as close to ”The Big Chill” as you can get without awakening the copyright lawyers. True, the setting is a summer camp rather than a funeral, but Paxton’s burned-out drifter has a certain hurt (as in William) to him, and Kimberly Williams even looks like Meg Tilly as one of the thirtysomething pals’ twentysomething fiancee. Yet if the characters are prefab, writer-director Mike Binder does know from summer camp. The fireside readings of ”The Cremation of Sam McGee,” the dumb contests, the ruthless pranks — it’s all here except the gimp keychains. The sentiments never go deeper than Hallmark, but this movie still makes a pleasant rental way to see out the summer.