I also am going to my first vikings game this weekend, with the same questions, since the game is moved back its going to leave a lot of time for other stuff before the game. We arent going to tailgate but we would like to go check it out, how does it work? All i know is what i see on the broadcasts and commercials...
Here's a map to where the lots are (Dome on the right of the map):http://www.kansasviking.com/map.html
Wander the lots some. Street right in front of the dome is closed and is a plaza with a bunch of stuff too.