Balancing laid-back beach vibes with a carnivalesque atmosphere, Santa Monica is one of Southern California’s favorite playgrounds. The young at heart find their bliss on its world-famous pier, which features a vintage theme park, while the stylish set flock to the Third Street Promenade for coastal-chic retail therapy. There’s also room to spread out on the city’s wide, flat beach—in fact, it's one of the top things to do in Santa Monica—where outdoor aerobics classes coexist with beach volleyball games, surfers, and sunbathers dipping their toes in the Pacific Ocean.