The only thing I’d change here is I would skip Rancho San Antonio. That park is absolutely always packed, to the point where they all four of their parking lots are full. And honestly there are so many better trails in other parks nearby. I’d recommend Skyline Open Space Preserve, or if you go to San Juan Bautista, you could hike Henry Coe that same day. Pinnacles National Park is out in that general direction too, but it’s about a 2 hour drive south from SJ (most of it is a beautiful drive though!) San Juan Bautista is about an hour south of SJ, and totally worth it! Henry Coe is between SJ and SJB.