In San Diego, there are many new Supercharger options coming soon. Carlsbad looks close enough for I-5 drivers to charge up on their way into the city, drive around and then stop in on their way out of town.
In addition to the one in Temecula, there is a new 20+ stall Supercharger just opened at the Lake Elsinore Outlet mall on I-15. Restaurants and shops at both these places to spend pleasant time while grabbing some electrons.
I am sure that every parking garage will set their own fees. I went to one that asked I show my Tesla Fob on the way out, for no charge charging. Over time, these facilities may change their policies, and customers will adapt their charging habits.
Part of these decisions will depend on us being good visitors. Don't litter the spots, please patronize the businesses, and be generallly good for the sites. They will welcome us back.
Tesla owners are pretty good at evaluating all their options and choosing the one that best fits their time and money budgets.