Check your passport is up to date
ATM card for pounds or euros depending where you’re traveling through
Plug outlet adaptor and phone charger
Call your phone carrier so your phone will work overseas. Turn the Cellular dat and data roaming switches off once you get on the plane.
4th of July American accessory
Tynwald Garden Party spiffy clothes
Umbrella or poncho for when it rains
Medicines in carry-on in case your suitcase goes missing
Medical insurance is valid for overseas
Address tags on your bags with your hotel address
Foldable bag for extra swag coming home
More when I think of it. Leave a comment for what you think is essential.