Cost to enter Sangay National Park is $2 for both nationals and foreigners. They say you need to buy the pass in the office in Riobamba, but quite a few people show up in Alao without it. There´s a park guard office (Alao Llactapamba) that is usually - though not always - staffed Monday through Friday including all night. The guard leaves Friday afternoon for the weekend. The current guard allows visitors to stay in the guardhouse for free.