Best Route for our Japan Holiday Plan

Dear Japan Guide

We are planning to go for Family Holiday this Dec 18 - 28 , 2017 ( 4 Aduts and 1 Kid 11 yrs )
Our Itinerary plan is as below :

DAY 1 - 18 Dec - Arrived at Narita Airport == Hotel (Stay Tokyo )

DAY 2 - 19 Dec - Transfer to Takayama == Visit Takayama Old Town == Hotel (B - Stay Takayama)

DAY 3 - 20 Dec - Transfer to Kanazawa == Visit Kenrokuen Garden / Photo stop at Kanazawa Castle / Visit Higashi Chaya District /Takayama museum of History and Art == Transfer back to Takayama == Hotel (B - Stay Takayama)

DAY 4 - 21 Dec - Visit Takayama Morning Market == Transfer to Shirakawago, visit Ogimachi Village == Visit Ainokura Village == Hotel (B - Stay Takayama)

DAY 5 - 22 Dec - Transfer to Fuji Area == Visit Oshino Hakkai == Photo stop at Lake Kawaguchi == Hotel (B - Stay Kawaguchi)

DAY 6 - 23 Dec - Visit Mt. Fuji lv 5 (depends on weather condition) == Shopping at Gotemba Premium Outlet == Hotel (B - Stay Kawaguchi)

DAY 7 - 24 Dec - Transfer to Tokyo

Is it worth for us to take JR Pass 7 days ? At what cost ?
And would you inform us the best way and route to fulfill our itinerary ?

Please advise / Thanx

If you take the train, then a train pass will definitely pay off. However, I think using the bus may be a better value and actually take less time overall. You will need the bus around Mt. Fuji, either way, as JR pass won't get you all the way there.

Nohi Bus travels to most all the cities you would be visiting, and is not significantly slower than the fastest train routes: https://www.nouhibus.co.jp/english/highwaybus/

Shinjuku (Tokyo) to Takayama = 6700 Yen (5.5 hrs vs 4.5 on train)
Takayama to Kanazawa round trip = 6000 (2.25 hrs each way vs 2 hours on train)
Takayama to Kawaguchiko = 5000 (4.5 hrs vs 7 hrs on train, and JR pass doesn't cover whole route)
Only ~18000 yen for bus vs 29000+ for a JR pass

and then you would use Fujikyu Bus around Mt. Fuji and back to Tokyo:
http://bus-en.fujikyu.co.jp
The JR Pass would not cover these routes anyway, as there are no JR lines at Mt Fuji.