Apart from in certain sections, you can take photos of almost everything! There so many photo opportunities, why not knock on the Dursley's door? Catch a lift on the Knightbus or hop onto Hagrid's flying motorbike? You will need to make sure that you have plenty of battery life on your phone, with the free wi-fi available, you are going to want to share your selfies in the Great Hall with your friends as soon as you can.