The park itself is not very special (specially if you get there at 17:00 and there is literally nobody) but you can follow the route to the castle ruins and other temples nearby.
Nice park with some sights along the walking path, mostly dense forest which is nice and calming. Takes perhaps an hour to walk around the full park, on mostly gravel paths. There are warnings posted for bears, but we didn't see any.
A really nice place to take a walk in the woods in (but that is because I love nature and I love a walk), not exactly a tourist place with 'things' to see if that is what you are into. You can get a panoramic view of the city though as you climb up. We saw a sign warning of bears displayed near the peak and freaked out when we saw a blackish animal. We talked briefly with a local lady and it turns out it's a Japanese Serow we saw 😂 thankfully she clarified it with the picture we took or we would have gone around boasting how we saw a 'bear' 😂
