Two and a half hours at this gym space should be enough time to let your Energizer Bunny’s battery run out. The birthday package allows you to choose two activities from its wide range of offerings: a jumbo slide and bounce house, soccer, basketball, swimming, dance or, for kids at least 10 years old, flag football. While you must bring the cake and candles, the Complex provides food, drink, paperware, music and goodie bags for your birthday kid and his friends. And if your little one is Ms. or Mr. Popular, have no fear: You can invite up to 32 peeps to the party. Ages 1–16.