That's in my neck of the woods!
Caligirl at first I thought you were insane....and really ambitious! Before I clicked on the route map I thought you were going to do Floyd Landis' route from the bottom of mountain at Interstate 15 up State Route 76 to Palomar Mountain.

Then I saw the route map. Since the ride starts at Mesa Grande, that's definitely doable, especially since you did Big Bear. I still think you're ambitious...just not insane now.
Have fun! It's a very pretty ride and Lake Henshaw actually has a good amount of water this summer. Enjoy Dudley's Bakery. My favorite is the raisin date nut bread, unsliced. I might consider riding the short route next year. This year I'll be in Colorado. But, I suppose I could do the ride unsupported any old day.
-Shimpie