If you want to get the real experience, the first thing I WOULDN'T do is take the metro. Get a parking pass and set up and tailgate. It's some of the best tailgating in the NFL. If anything, the cash lots have pretty decent tailgating themselves.
After the game, go to the player's exit and stand closer to their car lot because most of them stop by there. It's hard to get a chance to see other team's players (why would you want to anyway

), but they exit a little further down and usually come in buses.