you need to pack light and can’t bring extra outfits, be sure to have things to clean up with. wipes work great. find out where there is a laundry mat in order to clean clothes if you run out of clean clothes.
when you bring kids to new places, the kids are going to learn what to expect. it gets easier with time. the best way to travel with kids is to keep traveling with kids. it gets easier for all of you. 