Wish I wuz out there to join ya! I lived in SD for 12 years and did my best to explore all the twisty back roads California has to offer while straddling a motorcycle. Most of the paved roads (at that time) were in excellent condition. (Wish I could say that for more Illinois back roads!
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Some of my favorite memories that hang with me still (some almost 5 decades later) are the scenic roads to Ramona, San Ysabel, Julian, Mt Palomar, Mt Laguna (over-look to the desert), Descanso to Julian to Laguna to Pine Valley, Mt San Jacinto St Park (Rt 243 thru the park, in particular), and many places in between.
Added thought: A ZR-1 event, yes for sure. But! as discovered with the Mountain Run (MR1, 2, 3, etc) when the invitation was extended to other Corvette clubs in subsequent years, the whole event was enriched - because (IMO) it was more about the people with similar passions that added so much to the trips. (Just a thought for future gatherings?)
Course...if there's no pictures...IT DIDN'T HAPPEN!