http://mylittlenomads.com/best-hotel-swimming-pools -- My favorite hotel swimming pools in Tokyo. The best for laps. The best for kids. The best outdoor pools. There aren't a lot of hotels with swimming pools in Tokyo. And of the ones available most are in a luxury hotel and exclude children. If you're someone looking for a lap pool you have a little better odds of finding a good pool. The best hotel swimming pool for laps is the Park Hyatt Hotel in Shinjuku. It's a wonderful pool with great views of Tokyo. You might have seen it in Lost in Translation with Bill Murray. http://tokyo.park.hyatt.com/hyatt/hotels-tokyo-park The best hotel pool for kids is the Peninsula Hotel. More relaxed than the Park Hyatt (at least around the pool). Great spa too. (Not far from Ginza and Tokyo Station.) http://www.peninsula.com/Tokyo