Itinerary Advice

We are planning a 16 days trip to Tokyo cm May 24 next year. Intention is to stay a few days in Tokyo and then head north . We hope to cover Nagano, Niko , Niigata with furthest north to Aomori. Currently thinking of renting a car as there will be 4 of guys . Can somebody provide some good advice of route roration starting Tokyo and ending Tokyo. Please recommend the must see places . Much appreciate advice.

Seems about 2000-2500km(1240-1550mi) drive not so difficult.
Use Google MAP(.com) "transit[get directions]" by car.
CW,CCW or "S($)" letter(zig zag) route plans all possible.
Also National roads/express way drive recorders videos a lot on YouTube.

This is R4(National road) long straight drive video from mid Tokyo to Aomori city
over 740km[469mi] (x8 speed and cutted some breaks)
http://youtu.be/RIKxLOgzhek
Natinal roads are all free not Express-way[toll road](Japanese calling "high-way").

Read this guide[PDF] very important info a lot.
http://www.hkd.mlit.go.jp/topics/toukei/chousa/h20keikaku/e/e_all.pdf

First timer for OUT Tokyo driving as 1st travel day plans are
from Tokyo to Mt.Fuji(5th station P no snows but still cold) and more far
or round Mt.Fuji area(five lakes) then stay Hakone onsen a lot.
Japan land mark and fun experience is Fuji-san(snow hat) and onsen most famous.