The Irazu Volcano is the highest active volcano in Costa Rica at 9,175 feet above sea level. Its volcanic activity has been documented since 1563, and its last violent cycle of eruptions was from 1962-1965. Irazu is 50 km east of San Jose, and 31 km northeast of Cartago.
It is open from 8 am to 4 pm and is about $6 per person.
Very pretty, wear walking shoes. Self-guided tours.
And remember to park your car facing the exit! It's a rule, JUUUUST in case that thing starts erupting.