We usually take snacks in - breakfast bar, peanut butter crackers, candy, a little ziploc bag with a few goldfish crackers, etc. My little one used to bring in juice in a sippy cup. No, we don't pack a picnic lunch or anything, but I don't know of any of the parks that would not allow snacks in. Having a little cracker or "surprise snack" worked wonders for my little ones when we were waiting in line! My youngest still likes to have a "ring pop" while waiting in line!