Train ride!
π€ Super neat experience partaking in the operation of two classic early '50s diesel locomotives, the EMD GP7 and FP7 π Rode shotgun for 40 miles through some Arizona canyons with multiple switchings, and some maneuvers to swap the two locomotives around for the journey back home. I had HO scale models of both these engines as a kid (still have them boxed away somewhere), and have always been curious what they're like inside under operational conditions.