Los Posadas features 15 miles of hiking trails near Angwin, CA.
Drive North on highway 29 from Napa, through St. Helena,Turn Right on Deer Park Rd. Go straight through 4 way stop sign continue straight to Angwin through twisty roads, turn right on Cold Springs Rd, go straight through stop sign. The road becomes Los Posadas rd. Trail head is a small dirt parking area.
http://www.tripleblaze.com/trail.php?c=3&i=114