I've taken my 3 yr old twins every home game this year and we sit on the hillsides. Half the game we play "Look for Cy", we watch the cheerleaders / dancers, watch the band. There is more than enough there to keep them entertained.
We always go early to tailgate (usually get to the stadium by 8:00am for morning kickoffs), then we walk around the parking lots, score some breakfast from friends, go to the Little Cyclones area to get their faces painted, then get into the stadium by 30 mins until kickoff. Kids LOVE to watch the Band and the intro video with the Football team running onto the field. But.....We make it a hard plan to leave by the end of the 3rd quarter!