We've done obstacle course races (where the obstacles involve a punch, kick, etc.)
Full contact, crab walk, soccer is also fun (everyone in sparring gear, must stay in crab walk position, basic rules soccer rules, but you can punch and kick the people near the ball - from the crab walk position)
Ninja Freze - instructor at the front of the room, everyone starts at the back (a big room helps). Instructor turns away from the students, and everyone runs towards him. As soon as he turns around, you must freeze. If you don't freeze, instructor sends you back to the back of the room. First to touch the instructor wins.