I just joined a Lifetime Fitness and LOVE it!! It's ~$100 for me, husband and daughter. They have free babysitting for up to 2 hours, group classes with yoga and pilates, fantastic swimming pools (indoor and out), a cafe to grab a bite to eat, mine has a salon/spa with massage, top of the line work out equipment, basketballs courts, and rockwall climbing. I know there's one in Sugar Land, but I am not sure what all they offer. Here's their website...looks like the offer everything mine does.
Depend on how old your kid is they offer summer camps as well. And they offer Parents night out periodically.
Life Time Fitness - Feel good inside