For a cute and portable picnic place setting, wrap an old tin can in craft paper, stick a label on it, and fill with a napkin, flatware and a bottled drink. Click through for a tutorial and more tin can crafts.
A movie birthday theme offers a lot of flexibility in terms of activities. You could play dress up games, actually make mini-movies, or even play charades. Cut mini marshmallow in half and pinch back together for popcorn