Ooooh, Ortega Highway! Rode it many times from our home in Lake Forest. It's fabulous.
You could also join Vespa Club of America--I think your nearest chapter would be San Diego. My local chapter doesn't require you to be a member to join a group ride. You get towing with your membership. Check out Scooterwest in San Diego--they have events, including one coming in September: https://fb.me/e/2EgCxuJt4
3 day anniversary celebration