I rode it this weekend. It is really good stuff. Yep, good singletrack in Susanville. The lower part is an older more established trail network. Though fun and good for a warmup there isn’t much distance there. At least take Paul Bunyan Rd up and drop down the Creek Trail. The map only shows the new trails which are higher up on the mountain. Lots of short punch you in the gut kind of climbs to get there. There are maps all over the upper trails so no getting lost. Have fun with it!