Things we always bring:
Coffee, Equal and sugar to get us started
1-can of favorite tuna fish jic.......
Different size zip lock bags - great for drippy sunscreen bottles among other uses
A night light
Sun screen
Small flashlight
Kindle/iPad and chargers
At least one sweater for evenings in air conditioned settings
Any medications we need
Collapsible cooler (or use it as a carry-on)
Our next trip is going to be a quick and short one but I will still bring all these things and we are doing carry-ons only.