it all depends on what you couple like...

city or culture or nature ?

Thanks.

And also which is the best place to buy iPhone in Sapporo? Heard that Apple shop has closed in Sapporo, that leaves me with only Bic Camera and Yodobashi. The warranty works worldwide including Malaysia right? And also no tax imposed on us travellers. Prefer unlocked version cuz I want to use it in Malaysia eventually

Edited : And also those who have bought phone in Japan before and use it Malaysia. We all know that phone camera has shuttering sound when you take picture, but when you bring it back to Malaysia and use Malaysian sim card, does it still have that shuttering sound when taking picture?

The Tokaido Line shinkansen do stopped at Odawara station. From there, you can go around Hakone and Kawaguchiko

Do check out the Hakone Pass or Fuji-Hakone Pass

Budget?
Cheapest also will be RM700 per night starting price

You want Private Onsen Ryokan at Hakone...minimum need Rm3k starting price
Anything lower than RM3k wont have any ''private''

If you taking AA, get ready for any delay flight. Is best to take train for cost saving as train operates until 11.30pm if I'm not mistaken. Else you can opt to stay nearby Haneda for that night, then only move to city centre on the next day.