When my brother and I were kids, my parents were big on travel. They would routinely rent a driving camper, pack us into it and head across the country. Sometimes it was just us, sometimes we took a set of grandparents or another family, but it was always an adventure. We saw the Grand Canyon this way (twice, actually), camped in Disney's Fort Wilderness, drove through Death Valley - we saw all sorts of things and went all sorts of places. My dad was always willing to make a detour if the location seemed interesting enough.
In fact, I can remember him packing us up on random afternoons and taking us for a drive with the specific idea that we were out to "get lost". Maybe that's where my love for travel comes from?
What's your favorite childhood travel memory?