It really depends upon the age factor.
My niece and nephew went when they were about 10/12 and had a wonderful time. They really liked their picture they received with the dolphin. They thought it was quite fun and told everyone about it. People older may or may not enjoy it. The age you mention however do.
However, lilke all things, priority of what you want to do is important. We went ourselves to lunch with Shamoo and had a marvelous time.
The food was good and its a rare opportunity in life when you can have whales swimming that close to your table. It was also nice being able to ask questions of the trainers. The trainers also put the whales through additional routines which was quite fun to see. So you'll enjoy that.
So - its really a choice factor....since there are so many wonderful things to do in the San Diego area. Enjoy your trip.