I had some great bus trips as a kid.  My dad and I would go to visit my grandmother who lived about a day away by bus.  Since I was 8 or 10 years old at the time, my dad would drill me on math problems along the way and pretty soon, people from all over the bus would call out math problems for me to solve.  Once we got to grandmother's farm, I got to feed her cows and string barbed wire and do lots of stuff I could never do at home.