We meet 10 mins before the start of the yoga hike at the�Spyglass Access @ Barton Creek Greenbelt. �Spyglass Access Trail is one of five access points to the Barton Creek Greenbelt. It is located approximately one mile upstream of the trail start at Zilker Access. This is the most direct access point for Campbell's Hole, which is very popular among locals �Please click on the map to see a larger version.