Early in the strip, Calvin was a member of a Cub Scout (sometimes referred to as Boy Scout) troop. These story arcs consisted of Calvin going on camping trips with other boys his age. He has brought Hobbes along with him every camping event. Only a few areas have been seen, notably a field in the middle of nowhere and the camping site they stay at.
The Cub Scout story arcs were discontinued in favor of the family camping trips, as said by Bill Watterson in the Tenth Anniversary Book. Despite this, there has been at least one reference to this.