Despite what Instagram may have you believe, the Magic Kingdom hub grass (the grassy area located between Main Street U.S.A. and Cinderella Castle) ins't just for cute selfies. The hub grass is one of the few places in Magic Kingdom where you can sit down, spread out, have a snack, and let your kids run circles around you until they can't run anymore. It can get crowded before parades or fireworks, but you'll find it nearly empty most of the time.