Topjeongho Waterfront Ecological Park spreads around one of South Chungcheong's larger reservoirs, with lotus ponds, wildflowers, silver grass, and easy waterside paths. It is a gentle, open-air stop rather than a major sight, but it pairs well with the nearby Tapjeongho Suspension Bridge.
Come late in the day if you can. The reservoir, reeds, and bridge lighting make more sense in soft light than under the hard middle of the afternoon.