I like riding those walkways between concourses with all the flashing Saturday Night Fever flouro lights above. 3 hours of that and you will be very pleased with your scheduling.
Why not hang around RCC door discreetly and offer to buy someone a drink if they sign you in as a guest? 4 bucks or whatever (I have never once paid for a drink in a RCC!) for a 3 hour entry pass is a pretty good deal.
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Glen ~