Before vacation starts, check some of your vehicle's features that keep you and the family safe. Make sure the seat belts unreel and retract as they should after you buckle them. Debris can get caught in the seat belt retractor and keep the restraint from functioning properly. Check for excessive wear and fraying, too. A seat belt that snaps on impact won't be any help.
Speaking of impact, test your brakes. This can be fun: In a low-traffic area, accelerate to about 50 mph, and then slam on the brakes. If it takes you more than 100 feet to stop, or if you notice strange noises or grinding sounds, get to a mechanic. You don't want your vacation stopped short because of a car that won't stop safely.