Start at Crafton College behind the tennis courts. Park directly across from the trail head. Follow the fireroad climb all the way to the top. If you want to add some difficulty, take the single track climbs off the side. Turn right to go down to Yucaipa Park and follow the trails behind the housing development. There's a hard pavement climb at the end.
You can make this ride as easy or as difficult as you want. Simply take the single track climbs off the side of the fireroad to add some difficulty to the ride or just chill on the fireroad and take in the scenery.