Ayrsley Cinema, a movie theater near us here in Charlotte, offers free kids every Tuesday and Thursday at 10 am. I think it is great way to get out of the house while remaining air-conditioned. You don't have to worry too much about bringing your noisy toddlers either, becauset the whole theater is pretty noisy. It is always packed with day campers, but they open up a second theater when the first one gets too crowded, so don't sweat it if you are running late.
Here is a schedule for Ayrsely. It looks like there are some fun movies planned. My kids really love Cloudy With a Chance of Meatballs.
AMC Pavillions, another theater nearby, also offers kids movies for a dollar every Tuesday. Here is a link to their schedule.