Really? That kind of surprise me, I would think women would be more interested in that to catch some sun and get a tan.
There's a difference between meeting women at the pool of an apartment complex of 200+ units in a bigger city vs. meeting women at a larger pool party with with DJs connected to a business (bar/restaurant, hotel) with hundreds of semi-strangers attending.
The apartment complex pool is typically less people (usually less than 30). Most apartment complex pools don't have enough room for larger parties. It's kind of close to social circle game. Residents of the complex can meet each other. Often times, residents of that complex have a friend or two joining them who doesn't live in the complex. It's actually easier to approach in this setting as people are more relaxed here as compared to the nightlife type vibe of the second type of pool party.
A man will need approach skill even at a small apartment complex pool, just as he would need skill at the bigger pool parties connected to a business.
The bigger pool parties attached to businesses in most cities (I'm not including the Las Vegas Strip as part of this definition) are sausage fests because a lot of groups of guys have the same idea you have. It's a more nightlife type vibe but during the daytime hours. There are more groups of guys who go to these than groups of women. Also, many couples go to these.