2/3 Months travel

Basically, I'm currently living in Japan in the mountains doing a seasonal job. After this I will be driving around Japan travelling and visiting as many places as I can with a friend of mine.
I will have a car to use during this time so I am able to visit obscure places away from public transportation too.

My original plan was to travel north from Niigata (where i am now) up into Sapporo then across and down the east coast of japan following down to the very southern point where I want to go to Okinawa then return and travel the west side back up to Niigata before leaving Japan.

I'm generally interested in everything (to a certain extent). Does anything think this is totally unrealistic to do?

Sorry about essay, if more detail is needed just ask. Currently I'm planning the journey so nothing is set.

I don't think it is unrealistic, but it is going to be A LOT of driving. Planning your route ahead of time would be a good idea, and if you're interested in seeing the country, and have lots of time, skip the highways entirely unless it's for sure a boring area/you need to get somewhere fast. That'll save on tolls as well.

When I go on road trips, I usually plan a general route (point a to b, with potential points in between) then just stay at a love hotel on the route. That might get a bit expensive for you depending on how long your trip will be, since they can be hit or miss price-wise, and jack up their prices on holidays. But if the area you're going to doesn't have a good business hotel (The Sun Route or Route Inn chains seems to be almost everywhere, for example), then it's a good choice, especially if you're reaching somewhere late at night.

I've never been to Hokkaido, but we went on an 8 day road trip from Gunma to Niigata/Tohoku for the Sandai Matsuri a few years ago. It was a really great trip, and we got to see a lot of that country. I've also done a 4 day Gunma-Kanazawa-Noto Peninsula-Gunma trip, and another that I think was 5 days, Gunma-Nara-Ise-Gunma. My most recent was just a short weekend trip Gunma-Fukushima-Yamagata-Gunma.

If given the choice, I usually prefer to drive over the train, since I like a lot of flexibility. I think you'll have a lot of fun!

Yea I'm planning on avoiding motorways/toll roads as this will rack up in cost. I'm buying a load of camping equipment also to cut the cost and I plan on using an Onsen or something similar every couple of days. Food will all be from supermarkets to help cut costs too. just need to decide on routes, also I have that problem of having a car when I want to visit a city. More than likely will have to park outside the city then train it in.

anyone got any particular amazing places theyve visited when in Japan? any place il consider putting into my travels!