||The directions are confusion as there are not many signs; ill try to make it as clear as possible.
Take the Tijuana-Tecate Toll Road. drive for almost 45min passing Tecate and el Hongo and take the El Hongo - Mexicali Toll Road, drive 15min and exit on Vallecitos (If you get to La Rumorosa Toll House you passed the exit), once you exit on Vallecitos drive until you find and intersection and turn Left. drive on the intersection and turn right on the first offroad street you see (around 400m before the gas station) keep left on the round and follow the signs Rancho Picachos. You will arrive to a ranch were you will have to pay 50 pesos.