BEST TRAVEL PASS

Hi there!

I think that a 7 day JR Pass would suit your travel best.
You would really make the best use of the JR Pass by using it for your travel from Tokyo - Kyoto - Myoko Kogen - Tokyo.
This is of course assuming that you will be back in Tokyo within 7 days, otherwise it would be better to buy tickets as you travel.

You may also find this website helpful, it has a great guide on how to access Myoko Kogen.

Hope this helps!
Daniel