It is a pretty straightforward climb, but unfortunately bad weather turned us back. We also had no success in finding any locals who knew where the Santa Catalina research station was. It might be better to go to Chillogallo and catch a bus up to San Juan and start from there.
Ha! I second Glen on that one. We did a fun little hike to the top, with was covered by a little shack with the message "Peligroso". There was a man with a large gun in one of the shacks. Very interesting, but he paid us no mind.
The decent was a fun time, and very beautiful though long!