There are a few challenging places but from looking at the latest map, some have been closed. There is a place on 3 (coming from the east) that takes you up to High Point Vista. Most of it is just rocky, but there is a pretty steep and fairly long hill climb that has, at times, caused me to pucker up. Then there is the 614 loop by the mineshaft that can be tricky for less experienced riders. All 3 of the trails over the mountain from 6 to 8 were pretty hairy, but it looks like you can only get to Hawks Overlook (on 826) from 6 now, the other two are closed. I went over them several times on my rancher, but last time I tried it I thought I was going to die. LOL It looks like the challenging part of 8, on the east end, has also been closed. It wasn't too bad, but last time I took it, it was eroding pretty bad. I just hope they can repair the closed sections without making them too easy.