I used to live literally a BLOCK off the run course. I only ran that route when I felt the need to torture myself!! I felt your pain when I was reading your report. There is literally no shade, and that part of the course has lots of nasty little steep climbs. IMO it is a horrible course, but my guess is they are trying to keep La Crema winery- a major sponsor- happy by running through their winery. I used to run an aid station on the run course every year, and I also got to enjoy a day of baking in the sun.
Anyway, sorry the race wasn't all that you wanted. And the bike mess, but hope you at least got to enjoy the area.