Ship ahead bulky items you’ll think you’ll really need. This is particularly handy if you’ll be spending more time at certain places, like a porta -crib Ship things you don’t want try to find a match for, like a particular brand of infant milk, diapers, or jars of food, depending if your kids have any allergies or particular dietary needs.
I assume you are flying? Buy a few new toys just for the flight (pull out slowly as needed). Get a few books of stickers with their favorite characters. For our boy it was Paw Patrol. They can put stickers all over the windows and seats during the flight and then just peel them off before you leave. Also, an iPad full of favorite shows. Beyond that lot's of walking up and down the isle.