The number one attraction in the region is the Quilota Crater and Lagoon of course :). There are two hikes in and around the crater. The first one takes you into the lagoon inside and takes about 2 hours. The second one is a bit longer (takes 6 hours) since it goes around the crater itself. Both treks are worthwhile in my book :).
The way to the laguna is beautiful. If you are lucky enough to travel with a busdriver who is not trying to trash a record, pay attention to the little villages outside of the road.