Sitting in class in my High school I always think of how cool it would be to play there. My school is two story with 3 staircases and the lower level is fairly large with a wing for the gyms and cafeteria and big classrooms. That would be my dream place to play, especially since I would know the best spots!
On a more fantasy level I would love to play at some of the trail systems we dirtbike on, but while on a bike. You could play a much bigger field since you aren't on foot and it would involve shooting and riding skills.