The San Ysidro Trials area is a very unique destination where trials riders, mountain bikers, and outdoor enthusiasts come to enjoy beautiful scenery and technical recreation activities. Stone badland features are widely spread within the area and create distinctive topographies, such as the delicate ecosystems of tinajas. Tinajas are naturally-formed stone bowls that fill with water during the monsoon season and from snow melt. These pools provide an oasis for migratory birds, game species, and many other microorganisms.