Surprisingly, there are not many places which offer indoor swimming pools with big slides in or near Tokyo. There are a few, though, but it is always crowded and expensive for family day out. Japanese people may tend to enjoy the winter sports like skiing or skating or relax in hot spring in winter and play at outdoor swimming pools in summer.
But you sometimes want to swim and have fun at the indoor swimming pool with family, don't you? That what I felt and I found a good one for you.
It took only a couple of hours from Tokyo by car to this fantastic indoor swimming pool, called Aquaparadise Patio in Fukaya City, Saitama (HP: http://www.patio.or.jp/ - Japanese language only).
There are a lagoon pool with wave rides, 'lazy' river pool, 50m and 100m spinning slides, wet and dry sauna, bubble bath, children puddling pool, 25m swimming pool for serious lane swimmers, which are all heated and nice and clean.
Because it is run by the local government, the facility is simply designed and all the prices are reasonably set.
Adults 1,000 yen
Children (Elementary and Junior high school students) 500 yen per visit
Open 10:00 - 21:00 (open at 9:00 in summer time), Closed on Tuesdays
Free car parking is available.
Address: 763 Kashiai, Fukaya City, Saitama, 366-0816 JAPAN
It is the family-friendly facility for a day out from Tokyo.
Worth try it!