We didn't stay at the Coronado, we were across the water at the Hyatt Grand, but we did go out there. It was beautiful!! I have heard nothing but great reports about the place.
San Diego is beautiful and there are so many things to do. We enjoyed the Gas Light District and walking around Seaport Village. We also did the aircraft carrier tour, name escapes me, and the Duck tour, it's a vehicle that runs on water and land and the boy really enjoyed that a lot!
Of course the zoo, plus the beautiful park and museums all around it, and Wild Animal Park.
We've been a few times and have never been bored!
Have a great trip!