One word: Outstanding!
My wife and I try to visit Piatti in La Jolla every chance we get. Located just a few blocks from the beach in a very quaint part of La Jolla, Piatti's dining is just terrific. Their outdoor dining is also very nice, with white lights lining their trees, candlelights on tables, very peaceful environment, etc.
Their fresh-baked bread and balsamic vinegar/olive oil dip is a favorite of ours. Our kids love their pastas and pizzas, and my wife and I love their seafood with fresh steamed veggies, and some of their more traditional dishes as well.
Some of the best Italian food anywhere. Price is fairly reasonable, ambience is great, somewhat kid-friendly; great place to dine when in/near San Diego, CA.