January snowy road trip itinerary advice

I’d love some feedback on how sensible the following itinerary is and whether we can add in any stops on the way.

We are a family of 4 (kids are 13 and 15) and we’ve hired a motorhome.

We can’t ski, but want to learn to ski o suki.

Specific questions:
– is there too much driving?
– any recommendations for restaurants or other destinations that need advance booking?
– any places where booking a ryokan is advisable because of the access it provides to Onsen passes or skiing?
– recommendations for places with skiiing lessons for teens?
– should we buy ski gear second-hand or hire it for a week or day-by-day?
– places for the kids to meet or hangout with English speaking teens?
– festivals to go to?
– organisations where we can volunteer for a day?

We love:
– Rotenburi in the snow
– Craft, particularly knives, timber and pottery
– Beer
– Art, architecture
– Coffee
– Camping, caravans and camping cars
– B-Kyuu Gurume and food in general

Day 1 Tokyo (arrive late)

Day 2 Drive 1.5 – 3.2 hrs to Nikko

Day 3 Lake Chūzenji – Oigami Onsen

Day 4 – 5 Minakami

Day 6 Maebashi Hatsuichi Matsuri

Day 7 Shima Onsen

Day 8 Wed – Kusatsu Onsen

Day 9 Thu – Manza Onsen

Day 10 Fri – Karuizawa & Unno-juku

Day 11 Sat Nozawa Onsen

Day 12 Sun – Nozawa Onsen Fire Festival

Day 13-14 Drive back to Tokyo via Yuzawa, Minakami etc

Day 15 – 22 Tokyo
– Mira Costa & DisneySea (day 15, already booked)
– Ghibli Museum
– Sumo Wrestling
– Kameido Tenjin Shrine – Usokae Bullfinch Exchange

Edit: I cut this out for word limit; we’ve done multiple roadtrips in motorhomes or vans in Japan including in January snow