1. Prep the exterior
Keep her looking pretty by using a spray-on protective film like 3M's paint defender spray to prevent dinging the paintwork, and a glass-friendly equivalent, like Rain-X, for the windows. Also, use painter's tape along the chassis edges -- especially if you're going to kick up rocks on dirt roads. Which we hope you are.
2. Check your fluids
Driving around at moderately high RPM all day long with old oil sludging up everything is just asking for trouble, so be sure to change it before you take off. This is also a good time to check your coolant level, windshield washer fluid, and glove compartment jerky.