The nature here is simply stunning, with the river, the mountains, waterfalls, some shrines and temples in between - just beautiful. The park offers a lot of trails, many of them of the so called 'scenic type', meaning short and easy to access. Which is probably one of the reasons why busses of tourists arrive there every day. But even if it's crowded, it's still well worth it.
Only more challenging routes are hard to find, but some research in advance should do the trick.