Eating some Pocky ポッキー, probably, while watching the rain over the mountains.
The way the view of the landscape moves at this speed makes me wonder if the early-90s Sega developers that worked on Sonic got the idea for parallax background layers from trips taken on this line.
Trains on the Tōkaidō Shinkansen 東海道新幹線 travel at around 285-300 km/h, with the super express Nozomi のぞみ (“Wish”) making the fewest stops, the Hikari ひかり (“Light”) making a few more, and the Kodama こだま (“Echo”) stopping at all stations.
Here, a brief pause at Odawara Station 小田原駅 before continuing on. 10 minutes later, as the line heads south and then turns to the west, it's possible to get a great view of Mount Fuji 富士山, but the weather wasn't cooperating at the time.