sightseeing

Hello,

It's hard to say in general, I guess it would depend on the route that you will travel.

In general local trains and limited express trains can give you amazing views, Shinkansen trains travel trough a lot through tunnels.

Hope this helps,
Daniel

Well actually, between Tokyo and Osaka the shinkansen gives some excellent views. But between Osaka and Fukuoka there are a lot of tunnels that mar the view. I'd still take the shinkansen anyway, since your time is limited.