We took a week off an followed the race last year. At least the northern part. The top of Colman Valley climb from the coast was awsome. Lots of crazy fans, wine and cheese like the Alps during the tour. We actually sagged a member of Priority Health who had switched out wheels with a team mate back to the finish with his bike on our rack! We watched them fly down Oakville grade in Napa, and Cathy and I chased them down on our bikes after they went by, she had the leaders jersey and I had the Mountain jersey, and the crowds cheered and laughed as we flew by! It was friggin Insane!!
We're booking a room up in Windsor this year for it, and will definitely follow down to Hamilton.
I would suggest Colman valley climb as a good spot for that leg. plenty of parking and elbow room.
Pete