Hakone is good place for Onsen and Hiking.
We went to Hakone using Hakone Pass.(5000 yen from Shinjuku
valid for 2
days). If you want to take Romance car (
Express), need to pay 870 yen extra on top of pass price (one way).
http://www.hakonenavi.jp/english/index.htmlNow Hakone is good place to see 'Koyo'(leaves turn to
yellow).

There is a bus going to 'Hatajuku' from Hakone Yumoto station.
We hiked from 'Hatajuku' to use old path to the Lake. It was about 4.5km and 2hours walk.

You follow the old
stone path and can enjoy the feeling of old days.

It is good for a day
trip, but if you have
time, I recommend to stay at Gora Onsen, which has
White Onsen. Your
skin will be smooth after Onsen.

Staying at Japanese Onsen Inn is quite relaxing.
You can enjoy Onsen, taking your time, and food as well.