I've been to at least one live stage every year except last year. I've seen prologues, time trials, sprint finishes, and mountain stages.
I had a VIP pass for Santa Rosa a couple years ago, and I had a VIP pass for Mount Diablo mountain top finish a few years before that - both birthday presents from Diablo Wife.
This year I think I'll watch them go over the back side of Hamilton. It won't be decisive but should be fun with lots of spectators.