Take the Interstate 10 East past the Palm Springs Turn-off
Exit Palm Drive
Turn Left at bottom of off-ramp (towards Desert Hot Springs)
Turn Right on Dillon Road
Turn Right on Long Canyon Road

From Phoenix:

Take the Interstate 10 West past the Date Palm off-ramp
Exit Palm Drive
Turn Right at bottom of off-ramp (towards Desert Hot Springs)
Turn Right on Dillon Road
Turn Right on Long Canyon Road