I travel a lot for my job so end up eating out a lot these days.
You already have good suggestions for Mexican and BBQ.
Italian restaurants can be the hardest but like ladylyssa said - Olive Garden has the chicken picatta that is delicious and low carb. Other options at Italian - find a sausage plate, ask to sub veggies for the pasta side.
Pizza - scrape the topping off and leave a huge pile of “pizza bones” (crust). Watch out for sweet marinara sauces.
Mediterranean - lamb and other meats usually available. Hummas has a lot of fiber so not terrible, but hard to eat w/o pita bread to dip it in.
Indian - ditch the Naan bread and rice and enjoy the meats but go light on the sauces
Bottom line - you don’t have as much control eating out since you don’t know what ingredients the kitchen is using. Enjoy your vacation, do the best you can, and get back to strict keto or some fasting when you get back and you will be back on track!