So I want to book a ticket for a Japan trip. It's been almost 5 years since the last time I went (x-mas 2009) and that's the longest I've gone without visiting since the first time I went in 2001. Really miss the country and nostalgic. Ideally I'd like to visit Japan every 2-3 years and travel to other countries/states in-between.
Now I've pretty much been everywhere on the main island, but I've never been to Shikoku (kind of out of the way), Kyushu (not interested, had friends living here while I lived in Japan and I dislike WARM WEATHER

) and in Hokkaido I've only touched the tip with Hakodate. So I've told myself the next time I go to Japan I have to go check out the scenic nature of Hokkaido main and check out Sapporo.
Now here's the thing, it's kind of out of the way if I don't want to spend money. Flying into Hokkaido or out of Hokkaido is freaking expensive because of the transfer in Narita coming from LA. It's an extra $500+ a person at least. But since I always get the JR Rail Pass when I visit, I can fly into Narita and travel by JR for free.
But it's a long ride! Which is totally fine one way, but since I'll need to go up into Hokkaido and then U-turn it and head back down to the mainland and probably want to spend some time in Kyoto before heading back up to Tokyo...not sure how far up into Hokkaido I can realistically go without wasting a lot of my trip time.
I can probably get up to Sapporo in 2 days stopping along the way (maybe stay in Aomori), 2 days in Sapporo and surrounding area (Furano/Biei), 2 days back (Stay in Hakodate, because 10 hours on a train...eh, not enjoyable). Everytime I get excited about visiting Hokkaido finally, when I type up an itinerary like that I get kind of ho-hum about it because it sounds like a looooot of boring train.
If I have like 12 days (14 but you lose 2 flying) and I'm flying in/out of Narita cause it's cheapest, and want to spend at least 3 days in Tokyo, 2-3 in Kyoto...anyone have a good Hokkaido plan that won't feel like work traveling all the distance? My Japan trips are usually like Tokyo/Kyoto/Osaki + 1-2 oddball non-tourist places.