Texans vs. Broncos Tailgate

It's been years since I've been tailgating and my GF (whos originally from Denver) is wanting to go to the Broncos game and tailgate.

Any friendly spots to visit, possibly in the blue lot? She recently beat breast cancer and wants a chill vibe (lol) I told her it can get loud at times.

So far we're packing a soft cooler with drinks and snacks and are going to wander whatever lot we end up at.

Thanks for any advice.