That brings back memories. I was there on my 21st birthday. The whole evening had been bar hopping. I hadn't had much experience with alcohol previously, so I had decided to try a different drink at each one to see which I liked the best (not surprising, I didn't remember... or care by the next morning).
The waterfall urinal was well known, but frankly, I don't really remember it. I do remember they had a waterfall in the lobby as well and when I started over to it, my friends intercepted me and led me to the men's room with the admonition "Oh, no you don't! Wrong waterfall."