After you get off the subway at Suwon station, is it walking distance of do you need to take an additional bus or taxi at that time?
While you could walk to the fortress, I find it better to take a bus to avoid losing my way in the heat or freezing weather, depending on the season you are in. Save energies to walk and explore the interesting markets and exterior surroundings of the fortress too. It is very easy to take a bus from subway station to the fortress and vice versa - the bus stop is just 50m or less from the tourist promotion board right after you stepped out from the subway station, and on the same side of the road as the tourist promotion board. Short ride and you will notice the prominent gate to alight. However, on return trip, you may not exit from where you enter into the fortress. So, you can either circle back to where you enter, which will be a long walk, or simply take a return bus on the same side of the fortress. There will be bus time tables pasted on the bus stop to ensure you are on the right side of the road for return leg, at least that's what I saw on my return leg. :) If in doubt, ask at the booths located at edges of the fortress. Do remember the bus station landmarks where you board to travel from the subway station to the fortress, because the return leg is a loop through other roads, and does not pass through the same roads. So, remembering the landmarks around your "first bus stop" where you board is important. Hope this helps.
I walked. It takes about 20 minutes.
We took a bus to Paldalmun Gate as directed by the kind gentleman from the tourist information center just outside the suwon subway station. It took around 15 minutes bus ride. Just a tip though when riding the bus,the voice prompt does not have an English translation so keep watch of the stop where you want to get off. From the Paldalmun gate we walked for about 5 mins to get to the fortress. Enjoy your trip!
After asking directions from a local couple, we crossed the street and hopped into a taxi for about a ten-minute ride. Reasonable fare. We contemplated walking back (since, now, we knew the directions) but I estimated it would take at least 30 minutes. Yes, that's walkable, but we had also walked for hours exploring the fortress and surrounding area, markets too.
Get quick answers from Hwaseong Fortress staff and past visitors.