Coronado Bay - that's where US Navy ships are docked. You can go on the USS Midway - my boys did that in the summer of 2013 and they are still talking about it (mine are 12 and 14).
Have you done the W. Animal Park? That's different than the zoo. It's almost like you are on safari.
What about the Birch Aquarium?
There's Belmont Park - thre's an "Adrenaline zone" where you can go zip-lining, rock climbing...my nephews do this together.
February MIGHT be a good time for dolphin and whale watching.
Catalina Island is Los Angeles, however, you may have fun there too!!
Have a blast!