This place is also a part of the Unesco World Heritage. The walk around the fortress takes about 2 hours. It offers good view of Suwon and some historic sites.
There's a pathway along the walls that run up and down the hills and it offers a good relaxing walk. If you happen to walk by one of the three ticket booths then you'll be charged about a buck for the park's fee. There is also a trolley that could take visitors half way around the fortress, from the main gate Paldalmun to the archery place. It was too bad that archery was closed at the time.
While you're in this city, be sure to visit any public washrooms. Suwon is claimed to have the best washrooms in South Korea.