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This spacious park on the east side of the Sumida River is a haven for sporty types – the north end has several tennis courts and a pair of large sports squares to take advantage of, while the south has a spacious grassy area and an athletics field. If you're feeling lazy, take a stroll around the botanic gardens, fire up the grill in the barbecue area (reservations required), or check out the Museum of Contemporary Art at the north end of the park.