I would just order off the kid's menu everywhere. After bariatric surgery you will not be able to eat very much, that is the point. Note that I have not had the surgery, just heard others talk about it.
While this seems intuitive to people who have not had surgery, it is in most cases completely wrong.
Post-surgery, because your stomach can hold so little, it must be protein first. Since kid's meals tend to be carb heavy, they are not appropriate... even if you could choke them down, they would in all likelihood make you very sick.
I usually tell people that the surgery involves butchering your stomach.... like a child you will need to teach it to eat again.... slowly.... clear liquids, mushies, soft protein, etc. To repeat....because your new stomach can hold so little, it will be protein first. You will become an expert on protein drinks LOL I am almost 5 years post-op and still bring protein powder along with me on trips.
I often travel solo and frankly limit the number of sit downs I do. Look for places you can grab quick protein... yogurts, cheese packs, etc. Depending on how far out you are from your surgery, you may or may not be able to eat salads. Even now when I order a "meal" I focus on the protein and switch out the veg if I can .. since I can't really eat that much, it is about the experience as much as the food.
Be sure to seek the advice of your bariatric team for guidance on what you can/cannot eat at various stages. They are experts! If there is a post -surgical support group, join! There is a wisdom you will find in being with people who can share their experiences.
Best wishes on your future surgery! It is a process and an adjustment but I think I speak for many folks who have walked that road, that it is well worth it!