top priority should be to improve the fan experience at the stadium. so the first thing i would invest in are seat backs for every seat in the stadium.
That would bring the stadium into NFL status, you're talking a lot of money though.
This might sound minuscule compared to chair back seats, but I wish they would bring the radio broadcast back into the food court areas, especially at half time. It was kind of neat to listen to while waiting in line.
There use to be, and probably still have, a stadium improvement committee. They would be the ones with the answers you would think and/or one of the assistant AD's as well.