tgrahek

We travel a lot with our kids and Go Picnics are our best resource.  We use them on planes and in our day packs.  I used to get them online and pay shipping but now Target sells them and that is awesome!  We are also dairy free and additive free so there are only three varieties for us but that is plenty.
In airports, we often get oatmeal at Starbuck's.

I think you picked a good place to visit!  I was in San Diego a couple years ago and had no trouble with gluten free as well as dairy free.  They are very health oriented in San Diego. I don't recall the places I went but I do know that I used this great website to research ahead of time.
http://glutenfreeinsd.com/

Good luck!

We just returned from a cruise on Norwegian and it went great. We are all gluten-free and my kids are also soy free, dairy free, and artificial additive free and they handled it beautifully.  We didn't do the buffet except a couple times when the kids were hungry between meals and they had a hamburger no bun and potato chips.  That went fine.  Otherwise, we ate in the main dining room and ordered our meals the night before.  We always had room service for breakfast and we just wrote in what we wanted and they brought it (mostly gluten-free waffles!)
While I was researching, it seemed that all of the cruise lines can do gluten-free now.  If it were me, I would go with the balcony.  We spent so much time out there just sitting, napping, reading, or eating breakfast.  It added a lot to our experience, especially since the cabins can be so small.

We just returned from a Norwegian cruise and even though they said not to bring food off the ship, we did bring packaged bars in our backpacks and they didn't say anything about it.  
I researched ahead of time to see what restaurants we could eat at that were in the port cities.  That will be harder with a shore excursion that includes a meal.  The good news is that you will be so well fed on the boat that a plain salad one day on an excursion may seem like a welcome break!
Good luck!

We just flew to NYC last week and I was a bit worried because I was traveling with homemade capsules of baking powder in my carry on as well as a bunch of other meds.  Nobody said a word and all went fine.