I don't know how old your kids are, but 5+ they will love the bass pro shop. They have a shooting range, casting pond and just a lot of "Stuffed" animals including sharks, bears, deer etc. for a couple of bucks in tokens you will keep them happy and you cool. (and is a nice grown up toy store!)
As the previous poster said if you go by 140 and park in the private lots it is easy in easy out. However the private lots seem to be more guys and less families, no Port-a- johns etc. The hall of fame game days is mobbed. With younger kids, I bring a nerf type football, you bring a reg football the kids will be bouncing it off the other cars in the lot, gather some dirty looks.
If the game starts at 7:30, I would leave at 4:30. It will take you 90-120 min to get there and 1/2 hour to get into your seats. if you park in the main stadium lots across route 1. This will get you there 1/2 - 1 hour before kickoff. if you get there 1 hour before go to the Bass pro shop.