When renting a car check to see if there's a re-booking or cancellation fee. If your vehicule has unlimited miles/kilometers & if restrictions apply. You can use out of state/province or country. If you need their insurance, or your insurance will cover. If there is a fee to return to another location. The timings of pick/drop-off location. Free upgrades if your car not available. Gas fill-up fee. Find out final price when booking including taxes & fees. Watch out for any of these penalties or your deal may turn to a dud. Always inspect your vehicle before leaving the lot. Notify attendent of any damages or scratches. If traveling with a child that requires a child seat make sure they have one your child likes or else they will be uncomfortable on that long ride.