Road trip
Credit card with 0 or low balance due.
Mobile phone.
Camera to record at least some of the 'Smiles-Per-Gallon' forever.
I made a 7,061 mile road trip in November to go get a car & bring it home.
Parts of the journey were a bit scary, failed front wheel bearing, black ice, etc, but I met some awesome people, made some new friends & had an epic time overall. :-)