Second one I recommend is Gold Hill Rd. This is found off I-5 at the Smokey Bear Rd exit up past Santa Clarita. Gold Hill Rd is actually the southern entrance to the Hungry Valley SVRA, but you can tell the park ranger you’re just passing through to head to Alamo Mountain and they’ll usually let you in without paying the $5 fee. Follow it down along the southern edge of the park, and it heads through some hills and valleys, and even crosses a concrete creek dam at one point. If you continue up, you’ll climb to a trail that rings Alamo Mountain, with some camp sites and beautiful views of the forest.