Level of sneak difficulty: Impossible
How to get in: This is the only pool with enough security that I got caught sneaking in. I was close, though. Very close.
I walked in, went up to the lobby, b-lined for the main elevators, and hit the 20th floor up to the famed spa. It has its own elevator call button and everything. Immediately upon exiting the elevator, I ran into three desk guards asking how they could help me. I told them I was meeting a friend who was a guest of the hotel (it had worked before, right?). They had me sign in with my first name, my friend's full name, and my signature. Then they simply let me go down and see if he was there. I thought I was scot-free. walking through the pool area, to the outdoor deck pretending to look for him. And when I turned around to see the pool once again, I saw the desk agent following after me with my signed release in hand. They either didn’t like my handwriting or they checked the name in their database. I said I didn't see him and she told me I could come back upstairs and sit on the couch next to the desk to wait for him. I pretended to text “him” while actually texting my girlfriend in case I never saw her again.
Eventually after a long 11 minutes, I told the guards he was in the lobby restaurant and I left to go meet him. Scared and dry, I disappeared as quickly as possible.