None of the officers were smiling or friendly. Especially the male officer at the entrance who informed me that I wasn't allowed to bring a 400ml bottle of Pristine mineral water in a rude manner (after checking my bag): in a loud, shouting voice. It was a bit of a shock to hear. I could have done it the normal way, you know, I paid, it wasn't free. Other tourist attractions have friendly officers. Improve your service.