Astark
Whale Farts
IMO, mtb miles are so much tougher. I can do 50 road miles with relative ease but 20 mtb miles would kill me.
Park at Alpine, ride over the bridge and step a foot at Cunningham and then come back, doable.
But to ride Alpine then over the bridge and ride to and at Cunningham and then back.... I would need an oxygen tank with the paramedics near by to shove back the lungs that I've coughed up.
You can take the fire road at Alpine.. maybe 25 min up and 5 min coming down. You will be missing out on a lot of a fun stuff. If you want to mix it up in the trails you can park on anderson...take the yellow trail to the fire road and up the red trail to rockleigh. Hop off the trails and take 9w all the way down to the bridge.