Whitney Ranch Rec Center is great.  They have so many classes for the whole family.  My son has been taking private swim lessons for the last year at the Aquatic Center.  They also have group lessons which he was in before.  I really like the one on one attention he gets in the private lessons.  He moves through the levels much more quickly in private so it is worth the extra $$ to me.  Also 2 people from the same family can be in private lessons together for the same price.  That is what we do with our twins.  So that helps a little on the price.  Their activity pool is awesome.  Lots of water features and slides.  It gets really busy in the summer so make sure to come early.  The line can get long and the chairs and umbrellas go quick.  On the Rec Center side, they have a gym, basket ball court, racquetball court, and lots of class rooms.  My kids have taken, karate, dance, pre-k classes and more.  It is a great way to see if they like something before spending a lot of money on it.  All the classes are very reasonable in price and the instructors have been great.  They also have youth sports like soccer, basketball, baseball and tennis.  My son has had a wonderful experience in their youth sports programs.