This was a really great site to visit. It's a lot of fun to walk the trails up and down the ridges and there are a lot of very well preserved earthworks. it's a shame my photos don't do the site justice. The highlights include the "S Shaped Trench" and a series of several trenches right after one another on the west side. There are a lot of good signs pointing out various features which is rare for a mountaintop castle, but they're also important because the structure is somewhat difficult to comprehend when you're actually there. There is a volunteer organization that takes good care of the site.
The castle is heavily overgrown so you'll want to go in winter or early spring when there's no snow. There are also signs warning of bears so that's another good reason to visit while they're hibernating. There are 2 main routes into the castle. The north side of the mountain ridge has some parking spaces and you can walk up the Main route into the castle. The main entrance has the castle map and it's much easier to understand the castle structure if you start from here. If you're walking from the station though, you should probably take the trail that starts from along the highway. That's only about a 15 min walk form the station and will easily save you 30 minutes walking and a lot of energy.