Thanks for the recommendations! Yeah, I'll look into renting a car. This will be my first time driving in Japan and I hope it wouldn't be that difficult due to the language barrier.
I'll surely be trying out the soup curry and ramen.
Taxis are very expensive in Japan so just in case the language barrier's going to screw me over when driving in Japan, I'll look into using them slightly more often.
My parents can't bike and they don't like taking buses so taxi, trains and renting a car are my best bets.
My parents have agreed to go to Noboribetsu even if they'll walk for a bit. I hope the smell there isn't too horrid because sulfur smells bad.
Are the flower fields in Furano open by now? I hear that they're closed during certain months...
Shiretoko is where I'm thinking of going on my own. Hiking, scenery, camping and etc are my stuff. Parents would not like it because it's "too much of a hassle".
Obihiro's interesting, I'll take a look at it.
Sapporo, huh? Alright, I'll admit. I'm a slight anime fan and would like to go to a place that's sort of like Akihabara. I've been to Nipponbashi in Osaka and I hope there's a place like that in Hokkaido. Is there any?
Thanks so much for replying! (I'm sorry for taking a long time, I'm busy with stuff and just found the time now to respond-)