Do NOT plan on seeing Mt. Fuji as you whiz by, it's not visible or only partially visible almost all the time. You have to be quite lucky.

I thought some of the strange looking Pachinko Parlors you zoom by were more interesting than the rice paddies, but I suppose that's because of my weird sense of humor.

The Westin is in Ebisu so it is easier (and maybe marginally cheaper) to board the shinkansen in Shinagawa. You know, the shinkansen lines other than the Tokkaido are not quite as fast but they are a good experience too. For Y20,000 each, you could get a JR East pass that is good on all Tokyo shinkansen EXCEPT the Tokkaido line and, including the Narita Express both ways, could possibly be modestly more cost effective. In fact, if you were stopping over in Japan in both directions of your trip, you could get the "flex-pass" JR East pass for the same price and very possibly work it so you had train access included on both stopovers on one pass.