From Kawaguchi to Miyanoshita/Hakone

hello, I will go to Kawaguchi from Tokyo for half of day to see Mt Fuji. After sightseeing we would like to get our hotel in Miyanoshita/ Hakone. What is the best way to reach Miyanoshita, we will have the luggage. Does the Fuji Hakone Pass operate ?.Where should I buy it, in Tokyo, Kawaguchi or other place .
many thanks
barbara

I am sure you mean Lake Kawaguchi (or Kawaguchiko) rather than the Saitama city of Kawaguchi.

Does the Fuji Hakone Pass operate?

The pass will be a good option if you return from Hakone to Tokyo within three calendar days.

Travel between Kawaguchiko and Hakone is explained in general here:
http://www.japan-guide.com/e/e5206.html?aFROM=5200_6900

If you want to go to Miyanoshita, it will be best to transfer from the Odakyu bus to a Hakone Tozan bus bound for Yumoto or Odawara at Hakone-Sengoku. That bus will stop in Miyanoshita.