Tokyo 3-Day Wide Pass

Hi, I am travelling from Tokyo and staying at a hotel at Echigo Yuzawa for 2 nights. I am planning to buy the Tokyo 3 day Wide Pass. Can anyone advise:
1. Other than the Haneda, Narita airports and train stations, are there other reliable websites that sell this pass?
2. I am left with 1 day. Where would you suggest travelling when heading back from Echigo to Tokyo without having to rush back? Kairuizawa, Yokohama or mount Fuji areas? Thank you!

You can only buy it in Japan, not online. https://www.japan-guide.com/e/e2361_06.html

What are you interested in?

You show a non-Japanese passport to qualify - that's done in person, not online and is very easy/quick.
Where to go? You could do a quick trip to Nikko - depends on your interests.