|We finally left the nice campground near Tucson and headed south again this time to Organ Pipe NP. This park is the only National Park in the US where Organ Cacti grow. They look much like the Saguaro Cacti except they do not start from a single stem but in a cluster. So much for our cactus lesson. The park borders with Mexico and so we were stopped again by the Border Patrol but once they saw we were Canadian we were waived through with a smile. We just stayed for the one night and left for Phoenix in the morning.