Established as an altar for ritual sacrifice to the sun, this is one of Běijīng's oldest and most pleasant parks. The square altar, typically surrounded by kite flyers and playing children, is ringed by a circular wall, while the rest of the park is devoted to pines, quietude, the rituals of taichi practitioners and martial arts shīfu. The park is also home to a decent outdoor climbing wall if you want to climb off calories acquired from the park's gaggle of popular bars and restaurants.