When traveling clockwise on the Country Club #632 trail, you'll see a trail splitting off to your left. Take the trail to the left to climb up Pat Mullen Mountain on the Pat Mullen Spur.
This trail is short, but is worth adding for the elevation change. Most of the other trails have very little elevation change so you're going to want to get your heart pumping on this trail. Plus, it's a lot of fun on the way back down. There's nothing too technical, so you're free to enjoy the flow all the way.