Girls do not stand in the mile long queue for the toilets in the arena it goes nowhere! Walk straight in at the front and walk right down to the bottom block of loos and there is always loads of empty toilets!
Also take an empty bottle to fill up with water at the taps cause bottled water costs a lot in the arena! Also pretending that you are going to the taps with your empty bottle to fill up is a good way to push into the toilet queue as the taps are right next to the toilets!
It may seem cheeky to push in but people are just lining up in queues that dont go anywhere and you will never get to the toilet! ;D