Early December 2025 Japan trip

As the title states, will be in Japan in the first week of December for 9 days. Will in Tokyo, Osaka, and Kyoto. Also a couple of days in niseko snowboarding.

Please recommend places to visit and things to immerse in the Japanese culture (I know 9 days isn’t enough time but I would like to see a snippet) to each city. Also places to meet new people and other tourist.

Thanks!!

by Neither_Ad_5302