Midnighter: If you find a babysitter and are willing to drive about twenty minutes south on Interstate 5, there is a very unique bar in the La Jolla Town Center shopping center. It is called "Raised by Wolves." The entrance itself is unique (a wall that is on a circular platform, and rotates from the entry area into the bar itself). They make a bunch of custom mixed drinks, all of which have been given their own custom name, and all of which are about $15 bucks a throw. But just a wonderful place to have a drink. San Diego Zoo is a ways south. It is, IMHO, the finest zoo in the United States. Lots of attractions there for kids. Sea World is also nearby.
Fillippi's Pizza Grotto is a great family friendly pizza and pasta restaurant. Very good food, and reasonably priced. The link for their website is below. They have locations in downtown San Diego's Little Italy area and in Pacific Beach, but even the P.B. location is a bit of a drive from Carlsbad. If you are already down in the San Diego area for the day, it would be a good option. They also have a location in downtown Napa if you are ever in the Valley for wine tasting and hanker after Italian food.
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One Carlsbad restaurant that you should definitely consider is Casa de Bandini. This restaurant used to be located in the Old Town section of San Diego, and was iconic. Not sure why they moved to Carlsbad (perhaps a rent issue?), but the place was fantastic when it was in Old Town. Here is a link to their website:
Sorry that I can't recommend more places in Carlsbad itself. It is much smaller, and I have not been in Carlsbad in some years. There should be some amenities along the ocean. Cardiff by the Sea and Del Mar are also nearby, so you may check those communities as well via an online search.