After Central Park, this might be the nicest urban park I have seen (shout out to Stanley Park in Vancouver, though, which is also great, but quite different...).  The park is quite large, with paths winding here and there, a river of sorts running through it, various scattered lakes and plenty of meadows for sunbathers, football games, frisbee, and (believe it or not) BASEBALL! Warms this poor expatriot American boy's heart. And bring your surf board, because they actually managed to sort out a little surfing wave in the river! Jugglers and tight rope walking practice, and even some musicians... Basically, there is a lot going on, and yet plenty of space to find a little niche and get away from the rest of the people. If you get hungry, you can stop by the Chinese Tower for lunch!