The Dulaney Swim club has one very large T-shaped pool and a baby pool that was completely rebuilt and enlarged a few years ago. The facilities are very clean and safe and rules are strictly enforced. They limit membership so busy times are not terribly overcrowded and late afternoons and evenings are wonderfully peaceful and quiet.
They have pit beef parties every now and then that are really great, plus teen night, middle school night and I think elementary school night with special stuff for kids. The snack bar is great--good food, good prices, friendly family service.
There's also a playground for the kiddies, and a basketball court for older kids. They have picnic tables and grills, making it a great place for big parties.