map: http://www.ebparks.org/files/EBRPD_files/brochure/las_trampas_map.pdf
lots of singletrack not on the map. all trails east of bollinger are pretty technical singletrack. watch out for rangers towards bollinger side
north side is alamo. go up las trampas road to the very end at trailhead. have to bike up as the top half is gated community
http://www.singletracks.com/item.php?c=1&i=2489