Description: It's a great place to meet locals and visitors. 2nd, 3rd and 4th floor bathrooms open to the public. The 4th floor is the best. 3rd and 4th, you have more warning of someone entering. The 2nd floor opens into the bathroom. Use escalators or elevators for these floors; you don't need a room key.
You can also head down to the lower levels, and there are some great washrooms to play there. Try to avoid the daytime as there seem to be quite a few events going on during the day. If you go in the evening. You will not be bothered!