Entomology 101 - or Bugs for Thugs, as my professor called it - was the coolest elective I took in college. You could get extra credit for bringing in bugs to share with the class. I didn't have a proper container, so I spent one class trying to contain an Emperor Scorpion in a Chinese food container and keep it from escaping. Good times.
A geo professor once took us on a road trip as a "lab", without telling us where we were going. I actually was driving the school van, so that motherfucker had me driving for nearly 10 hours with stops at all the very best road cuts in the Midwest (one would hope.)
I am sure I would have liked it somewhat more if I weren't the one driving.