Sta. Ana is a small fishing community at the very edge of Luzon. The nature around is really beautiful, but as it's also not very developed, the surroundings seem somewhat inaccessible.
At least that was our impression. We did not see any organized trekking, or even diving. The only organized trip we could see was to go to Palaui island, and some fishing trips. Surprisingly, it's possible to find some decent food. There is a place at the main road "opposite" to where Country Inn is, which is partly a restaurant and a drinking place. Quite nice decor, and the food was not bad! Also, the fried chicken sold at the road near one of the bakeries is really good and cheap. Do keep in mind, though, that there is not really anything you can do in town. So make sure you plan some day trips to the islands/beaches. Don't expect the place to be happening.