Glamis / Oldsmobile Hill is a 6.4 mile loop trail located near Winterhaven, CA and is rated as difficult. The trail is primarily used for off road driving and is accessible from November until March.
off road driving
Glamis Sand Dunes an off road paradise. You can ride your quads and dirt bikes for days, and off road your SUV or Truck for an amazing time. If you visit Glamis on a holiday weekend crowds can reach in the thousands. On regular weekends expect to still see many people but its a giant sand box so you shouldn't have a problem finding a place away from the crowds.