There is a guided hike everyday up to the summit, try and coordinate with the park or the Tourism Police.
Access
From San Salvador take the highway towards Sonsonate. After Ateos, at the Esso Gas station take a right to Complejo los volcanes. After 10-15 minutes, take a left to Complejo Los Volcanes. Drive all the way up to the national park, 3 kms before, take a dirt road to San Blas area.
Rules
N/A
WEATHER
High mountain. Expect faster and more challenging conditions.