We were just there and it is beautiful. As Lavender Peach already said that one restaurant is pretty much it, and other than the little snack cart kind of places there is nothing else nearby.
We just wandered around and enjoyed the grounds and architecture of the buildings since we didn't have a lot of time (and we were getting hungry and didn't want to eat there). The Botanical garden is pretty and free (it opens at 10am), and the ponds and fountains around there are really pretty. There are plenty of nice museums, but we didn't have time to go in and check them out.
We found tons of great places to eat over in Old Town which is just minutes away on I-5. There are tons of great Mexican restaurants and other options as well. We had some good pizza there.
I hope you have a great time!