I don't really have much of a checklist for the boat.
We take a cooler, dog water and a trash can.
Leaving the boat is gathering up those 3 plus whatever else we picked
up. (usually just trash)
Gas is the wild card. It is not an "every trip" thing.
If we are just putting around, we may only burn a gallon or two.
I put 5 or 6 in at a time depending on which can I use.
When I notice that gas is coming up, I hang this on the dog water and
hang it on the lift switch when I am getting off. Works great.