My wife and I had a few days in the area before a conference we were attending. We noticed that there were several visitors centers on the mountain. We chose to start at the Johnston Ridge Observatory and work our way down and we were not disappointed. It was the most informative and beautiful of all of them. From the Ranger presentations, the displays, and the movies we learned so much about the events leading up to the explosion, how nature operates, and what has happened on the mountain since. There are several trails that start at the observatory and they are breathtaking. Well worth the fee paid to be there! We would encourage everyone to start here and work your way back down the mountain as it makes the others much more enjoyable.