Would you say I'm covering most of what Hokkaido has to offer(without a car) in my current route or do you have some suggestions to improve?
Also, if you can think of any good stops on the way south to Tokyo other than Aomori it'll be great :)
Well, there's Niseko, but that's more interesting in the winter with winter sports and all and Furano with the flower fields, but that's in the summer, so I guess you're pretty much covered :P There's the
Blue Pond if you're interested in photography/nature spots though, but it's a bit far from anything else interesting.
I enjoyed visiting
Hirosaki near Aomori, and September is right in the middle of apple season. There's buses going around including a tourist bus that makes a round trip to the castle park. If you do visit, I'd suggest a visit to the Apple Park as well if you're interested in apples, since you can pick and eat different apples there.
I've not visited a lot of other places in Tohoku, but you could check out the samurai district in Kakunodate if you're interested in that kind of thing, Ginzan Onsen if you want to do more onsen, and you could do a day trip from Tokyo to Oze national park if you want to do more hiking.
Yes is not like our 2yr kid is gonna be getting on lots of rides plus the wifey just wanted to see Xmas decorations. I'll don't think the crowd is as bad as in Disneyland (I hope not :-/ )
Well, early estimates say that'll be 60K+ people in the park. If you want to eat anything while there then it might be better to leave the park and go to one of the eating places near the train station instead of waiting in 1 hour queues to buy hot dogs from a stall (or 2+ hours getting into one of the restaurants). :P