Double decker trains I just find fun for some reason, and you get slightly better views riding up top over fences and walls and such.
I remember taking the bus from Plymouth to Millbrook (mid 1990s), which included a trip over the River Tamar on the ferry. I can't remember if it was one bus or two to get there and back.
One year I recall a harsh winter and icy roads. On one trip, I was sitting in one of the top front seats. It was early evening and I was heading home to Plymouth, idly watching the stiff, whitish countryside through the haze on the windows. The bus lost grip on a gentle incline and started to spin gently but, well, I nearly needed to change my trousers. We did a good two complete spins until a wheel hit a bank and we came to a halt facing mostly backwards. "Drives", made a polite announcement and reversed down to the bottom and then did a very gentle 10 point turn and cracked on.
Fair enough - we are missing out on some lovely views.