After riding the Yorba Linda Recreational Trail from west to east, and if you are on a MTB, then I would recommend that you continue on to the Yorba Linda Lakebed Park. You can get there from Grandview and Buena Vista. Take Buena Vista going west and once you pass Scenic View Drive, go left onto the trail. There's a trail sign. The trail will go up for about 50 feet, then down a very short and steep distance, but make sure you go left for the long ride. There are many trails to take from here. Check out Google Maps if you don't know where it is: http://goo.gl/maps/vsy96