Some non-Disney stuff:
Universal Studios is a lot of fun with plenty of cool rides that your kids will enjoy. Also, their new Harry Potter thing just opened recently. I hear it's great.
If you're a big movie fan and you're looking for a good behind-the-scenes tour, I highly recommend the Warner Bros studio tour.
A short drive up into the Hollywood Hills will bring you to the Griffith Observatory (near the Hollywood sign). The view from up there is pretty spectacular.