JR Kanto pass to Snow Monkey Park & Mt.Fuji

Refer to Daniel info that, I can use JR Kanto pass for most of the way to Nagano but not the complete way.
I got more questions

1. Since it's not complete way, Can I know how to get the monkey park by using JR Kanto pass?
2. What is the cost after using JR Kanto pass to get to Snow Monkey park?
3. As I will stay 6 days, should I buy 2 JR kanto passes? (it's valid only 3 days from what i read on the website)
4. Where I can buy JR Kanto Pass beside the JR EAST Travel Service Center at Haneda Airport? (I've read they may close the office on new year festival) I'll arrive there on 29th December 12:30PM
5. JR Kanto Pass is also valid for Asakusa, shibuya, ueno, imperial palace, ginza, roppongi?

Thanks in advance