I would always take my trusty binoculars and have hours of fun with those!
if my best friend was allowed to sit with me we would take it in turns eying up the dishy bro's on the opposite side of the stadium. If we weren't allowed to sit together we would try and engineer it so we sat on opposite sides and she would borrow some binoculars and we would wile the hours away making discreet hand signals to each other across the pitch.
This worked well until you spotted brother High and Mighty sitting two rows behind my friend who just witnessed me giving the finger to my friend through his binoculars. Then word would get back to my parents and my binoculars would be confiscated, only to be used during the drama. Spoilsports!