I visited a local bike shop in Ramona to get more info about the Grand Loop. I purchased a map and I pencilled in the exact trails I needed to ride to complete the Grand Loop.
Well, I was mis-informed, ‘cos bikes are no longer allowed on the the trails in the Cuyamaca Rancho State Park. I did manage to connect a few fire roads for the first 9 miles, and I then had to follow the road back.
I’m sure there might be a way to create some form of a loop using fire roads, but the real trails are out of bound!!