Malakoff Diggins is the site of the water canon mining days during the gold rush, looks very spectacular. The North Bloomfield is an old mining town, now a ghost town interesting to visit. Missouri bar trail is a fun long singletrack downhill to the South Yuba river. Then follow the river on a challenging, sometimes steep, sometimes technical trail. Not for beginners.
Along the South Yuba there is a section where the trail is gone. It is needed to carry the bike for a little while on the rocks near the river. Lots of fun!
Epic ride. Very diverse views, terrains and difficulty. Not for beginners.