Pt. 2
Lower your expectations. I had a ton of activities planned for this trip to Hawaii- but I soon realized that those plans were not feasible.
Make your vacation more kid led. Let them dictate the schedule and do the activities they want to do.
A little extra screen time won't hurt anyone, and can be a great tool for traveling with little kids. They don't have their toys/activities from home, or friends, to entertain them.