If you go to Torla, it most likely is as a staging area into national park, Monte Perdido de Ordesa. This park is great for casual walkers to extreme climbers. We are way toward the casual end, and were extremely happy with the views we had for a hike/walk of about six hours.
There is no access for cars but there is a large single decker coach every 20 minutes from the large carpark below Torla village. This does not run during the winter but then cars are not banned.
The bus stops on the way up at a National Park Exhibition Centre and you can get out and have a look then get on another bus to the terminus with the same ticket. At the bus ticket office you can get a leaflet with suggested walks of varying standards.
I was restricted to the easiest one by a heart condition and it is little more than a few miles stroll beside the river but it is a mountain environment and very fine. I talked to people who had undertaken harder walks and some are very hard indeed though these are probably the most spectacular, as you might expect.
Another possibility for the non-mountaineer is to walk back into Torla by a footpath with various diversions to look for waterfalls.
There are other towns from which the park can be entered which is pretty apparent from a map but it is only Torla where you can get the start with a coach.
However it is well worth taking the bus to Ainsa and back for its own sake if you are going in and out from the west - as most do.
I have already done a bit about the Alto Aragón under accommodation but it certainly attracted people from the campsite and elsewhere as well as residents. I stayed three nights. Meals were not included but it never occurred to me to try anywhere else because the food was so tasty and the quantities were suitable for people who had been using energy.
Only one person on the staff spoke English and I am afraid some diners were extremely rude on this point. They were not English, though they would have been assumed to be if I had not been listening and able to explain!
Favorite Dish: Rabbit with celery - delicious and different!