Tama City's indoor swimming centre houses a 50-metre pool, a wave pool, water slides and kids' pools, making it a fun destination for visitors of all ages. There's also a steam sauna, a training room and a small 'sports hall' on the premises. Note that the entrance fee is for two hours during July and August – stay longer and you'll need to pay extra.
Make sure to use a swimming cap in the 50-metre pool.