You can get your passport stamped at the places listed here, after the visit or activity in question. In the case of shelters (hostels), the passport will be stamped once you make a purchase. At each view point, you will find a relief plate with a unique icon for that place. To "stamp" your passport, you will have to trace that icon on one of the designated spaces on the pages. You will need a pencil, don't forget it on each trip. For activities included in the programme, the activities guide has the stamp, and you should ask them to stamp your passport. At fairs and other events listed, you will find Alt Pirineu Natural Park stand where you can get your passport stamped.