Oh, we managed to get a single day pass into the bivoac for USD 400 pp.
Yup, these need to be pre-arranged through the ASO otherwise you are not going to get in
The swag they offered was really shite.
Of course being an F5 nut, I did not go on the official tour, which as Deadly99 says is quite crap, but spent the time chatting to racers and teams. Had dinner with deadly & Ned, lunch with Frans Verhoefen and few others. It was well worth it and I would do it again as a tourist.