2/3 singletrack, 1/3 Class A paved bike path with two road crossings along the route. Mild hills all along the route. Go clockwise for mostly downhill.
From Sacramento: Get on Folsom Blvd. and head East to the end. If you cross the river, you just passed it. Trailhead is next to the Light Rail Station.
http://www.singletracks.com/item.php?c=1&i=2015