Lots of wild bears around!
Often true at these kinds of events. It's commonly the older guys with more free time, more money, and more hair on their bodies (if less on their heads) and more weight around the middle, who can manage to attend them. Regrettable from an eye-candy point of view but true.
But to show you that pool party place during a quieter time, here's a couple of pics I took on two different visits.
The first is from a 3rd-floor sundeck, looking down onto the railing of the lower deck, from where the photo of the party was taken. The second pic is from roughly that same 2nd-level party viewpoint.
You'll note the rainbow flags, the same lounge chairs, same umbrellas, same snack bar, patterned paving blocks, braced metal arm where the foam machine is hung, and the flowering tree to the right.