We had much more fun at the Griffith Observatory than at the Universal Studios, and I am sure we will go back there in future.
The Observatory is home to a small astronomical museum, several telescopes that are open to the public, as well as really cool planetarium that has several shows every day about space surrounding us.
The Observatory is located on the southern slope of Mount Hollywood in Griffith Park, offering breathtaking views of LA. Even if you are not interested in astronomy, it still seems to me that you would love this place as it is so beautiful and serene there. I would definitely recommend stopping there during your next visit to LA.
Views from the Observatory: