A great way to explore Cuyamaca Rancho State Park is to check out the Poker Ride loop. On clear days, you can see all the way to the Salton Sea, and in winter, snowcapped Mt. San Gorgonio and Mt. San Jacinto can be seen. Enjoy the 7-mile fast, double-track (though it rides a lot like single track) descent on the west side of the loop, the wonderful views on the single track of Cold Spring Trail, and the flow of the CA Riding and Hiking Trail on the north end/bonus single track loop.
Logistics: Park at the Visitor Center. There is a day rate fee. There are bathrooms at the parking lot. You can park along Route 79 at different spots, if you know the area well enough and how to jump onto the Poker Ride loop.