So what if most of the swimmers at the UP pool have their own swimming pools back at the mansion. This isn't about practicing the dog paddle. It's about navigating certain social circles. Splashing among the skinny MILFs and young nannies, you'll find the scions of some of the wealthiest families in the Park Cities. OK, they're still in swim diapers and water wings, but someday they'll inherit everything they have no idea right now that they're entitled to. Hang out by the snack bar or shaded baby pool to hear waves of good gossip about who's who (and who's leaving who). On summer nights they have free "dive-in movies" featuring screenings of family comedies while you float. The catch is, to get wet here, you have to have a UP address on your ID or be the guest of someone who does. They wouldn't want the hoi polloi polluting the waters, dontcha know.