The drive-in had a playground for the kids to play, it was inexpensive, and it was completely okay for us to bring the baby with us!
We saw Planes and Despiecable Me 2 before we left, but had we stayed Monsters University was starting at midnight! I had a hard enough time staying awake through the second one though. Elinore went to sleep after movie #1 in her stroller and she slept through the rest of our time there.
We plan to take advantage of the place again!