What are some suggestions and tips for a trip to Japan?

Question:

Hello all. :) On a random, spur of a moment sort of thing, a friend and myself decided to commit to completing part of the very first thing on our bucket list: visit Japan. We plan on taking a two week trip with a couple of other friends and a possible addition of two more. However, a majority of us will be starting senior year within a few months so obviously this trip won't be happening for a couple of years or so. It really depends on when we can all raise up the money. While I realize the exchange rate can change quite easily and so forth, I figured 5,000 dollars each would do the trick, but I am hoping that each of us will be able to raise more and take as much as possible.

What I'm basically asking is what are some suggestions and tips for planning a trip to Japan, what are some things that I'd need to know in advance, and.. basically any tips and suggestions. xD While there are a few places we want to go - one being an animation studio, Tokyo, and Mt. Fuji - we're not quite sure what is worth seeing and what's not. If anyone has any suggestions in that department, it'd be much appreciated.

I know it may seem a little silly to be planning a few years in advance, but why put off tomorrow what you can do today?

Answer:

Do not tip at restaurant or other places.
Do not talk on cell phone on train or bus.
Let passengers exit first when you are about to get on train.