The kids and I ventured down to Balboa Park with some friends to check out the Reuben H Fleet Science Center and Train Museum. Although it was super crowded (due to it being free admission day for SD residents) we had a great time. There was so much for AJ to play with...and learn...okay, just play with. In another couple of years he will be able to actually understand what most of the exhibits are intended to teach you. If you haven't been to either of those museums, I highly recommend it.