We drove to the coast at the weekend and even though it was hot (the car has no air conditioning) it was a great musical journey. Hunchermuncher has this great gadget that enables you to plug your ipod into the car stereo cassette player, which makes any journey instantly miles better in my opinion.
Some music is just great for car journeys. I often make a car trip playlist trying to cater for the tastes of whoever is travelling. This weekends big hit was "Won't get Fooled Again" by the Who. It's just right for a road trip although if you are driving you need a passenger who can do the air guitar and drums for you!