the road starts in san marcos. going from POP turn left from manolo tavarez justo to san marcos (shortly before texaco station). follow the road and turn left again towards the new cemetery. then just enjoy the ride. 15 minutes, maybe 20. beautiful views. drive all the way to the end, the road will fork: right to cupey, left to teleferico. take the left.
the road that followes is steep and slippery. better to have a jeep but i am sure it can be done in a normal car too. takes further 5 minutes or so to get to the top.