Tel 5321 1111. There's free admission into the grounds of most shrines and temples. Don't forget too, the Imperial Palace. The East Gardens of the Imperial Palace are amongst Tokyo's most beautiful. Inside you'll also find a museum housing Emperor Showa's art collection.
Entrance is free.
Ueno Park is famous for it's cherry blossoms and lotuses. The Sumo Wrestling Museum is next to the Kokugikan Sumo Wrestling Stadium. The exhibits include pictures of the all-time greats and various bits of memorabilia. Another free museum - the Kanto Earthquake Memorial Museum, is close by. A large, scale model of a nuclear reactor is amongst the many exhibits.