Let's all meet at the Park Office which you will see after entering at the La Paz road entrance (the main entrance).
A park map is here - https://www.ocparks.com/civicax/filebank/blobdload.aspx?BlobID=59703
There are extensions for those who want to go hard - for mountain bikers we can continue on the trail down to the water treatment plant which is gorgeous. We can also extend with pavement by extending north through the YMCA. It all depends on who attends and what the energy is like.