Teddin Water Park is a family-oriented water park south of central Cheonan, with indoor and outdoor pools that make it useful in more than one season. In summer it works as a straightforward pool day; in colder months the spa facilities are the main reason to come.
It is best treated as a practical family stop rather than a cultural sight. Bring swimwear, allow time for the trip out from the city, and check seasonal opening details before setting off.