>>1017508Just go to Hokkaido and try to plan a journey that'll whip you through the middle of nowhere but returning you back to the real world before you freeze to death. If that isn't encouraging, then just try to think of all the lines that'll be closing!
Otherwise, also consider the Chuo Line via Wideview Shinano since it goes through the mountains. Most preferably, go for the front of the Green Car since you get to see the front of the train
Upstairs on the Max Toki for the Joetsu Shinkansen is also preferable since it has a much better view (for what isn't tunnel anyway)
If you plan to burn time, consider the slow routes too like the Joetsu line to see Doai and the like
And go to places like around Mt Takao and Hakone
There is more to Japanese railway than just Shinkansen
Maybe Hisatsu Orange Restaurant? Kintetsu Shimakaze?
I presume you have enough of a brush of Japanese to survive a tourist length? Because you'll need to be making at least a few reservations for good seats on trains, possibly a day or so in advance for some, especially if it's peak season. Also, Green JR Pass. It does mean you'll have to reserve on all limited express and Shinkansen services to make the most of it but it's totally worth it imo
But most importantly, in between the trains also go for a stroll around as a lost tourist. You'll stumble across interesting things and nice food and that's ignoring the regional selection of obento
Japan is the candy store and you are the child with your parents' credit card (or you own I guess, ignoring that they generally prefer cash). Unless you've already been before, in which case you probably know your way around well enough already
Just don't be me and spend an unhealthy amount of time on the train shitposting on 4chan