SFmcjohn Dirt routes looks like you have it pretty dialed in on the maps for getting to dirt the fastest and the longest from the south. Once you get around/west of Indian valley reservior the options are endless. It's probablly going to take you longer than you would think once you get around the reservior. I would suggest twin valley road or take M5 to Letts lake to M10 to bear creek into the campsite. If you get stuck in traffic or get a late start cut out the reservior and just ride hwy 29 to clear lake oaks and hit high valley road that droops right in at Bartlett springs and M5 Also pope valley chiles pope valley and Butts canyon are good ways to get off the big highways and see some nice two lane county roads.