I just wanted to add that there is another mystery "lounge" over Test Track with a phenomenal view! Last year I let the girl talk to me about a new vehicle (my lease was running up) and although I am loyal to Hondas, when she found out DH had a GMC she gave us passes up to the lounge. we had some lemonade and just sat for a while looking at the view, then got 2 fastpasses..which was awesome because we had only been in the new car sales area because the line for the ride was too long! AND it has bathrooms. It is also for people who work for GM and its associated dealerships.
So if you are a loyal Chevy/GMC person don't automatically shoo away the salespeople!