I always pack some Disney plush and dolls. It's always an added treat for the girls at nap/rest time to see how they've been arranged on the bed.
Last trip I brought smocks. This way the girls could have a character breakfast in a cute outfit and if they have a little mess (i.e. strawberries down the front of themselves) - the outfit underneath is at least spared and looks nice the rest of the day.
SafetyTats b/c I always want them to have some kind of ID/contact info on them just in case they get lost...especially w/DD5's food allergies.
Snacks just in case we're in between meals and in between true snacks, but energy/blood sugar starts running low. Hunger and blood sugar and factor into moods- so it helps keep the peace.
There are a million and one other little things I bring or do (like outfits in ziplock bags to keep suitcase chaos at a minimum), but my personal favorite...I bring
PIXIE DUST! I do a lot of cake work on the side and fine grade cake glitter is perfect pixie dust. So, I usually take one of the more generic shades (i.e. white rainbow or light green rainbow) and randomly dust my girls. Sometimes they know it- especially if princess dresses are involved...or somtimes I dust them on the way out of the room and they don't notice that they have had a visit from a fairy until a bathroom break.
![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I know it sounds more girly, but I have a friend with boys who said it was also quite magical for them too.