I took the bus in the afternoon to Ciudad Guzman and then to El Fresnito from where I walked up to the park entrance in about 4,5 hours. Slept at one of the cabins there (187 pesos) and went up the next day to the summit in about three hours. Great views of Volcan del Fuego! I then also climbed to the north summit, which is a bit of a rock climb. I went down Los Tubos back to El Fresnito, nice lush forest. Saw nobody else on the mountain the two days except the rangers.