Hanging around outside after dinner we realize that the side of the lake shore that we are on is not exactly for the wild party guru's. Maybe it was more uphill to the station direction, anyhow, we were perfectly fine with our hotel cozy bar with a lake view and the cold sake wine we were tasting. Additional to this there was also local band entertaining us with local music.
I do not know if there is any nightlife in Hakone National Park. You can have your "usual" nightlife with discos, pubs and casinos when you are staying in Tokyo or Osaka/Kyoto or some other big town. In Hakone you have instead a wonderful possibility to enjoy night-bathing in the outdoor onsen.
And believe me, it was a fantastic experience to sit in the warm mineral water under the dark sky and drink sake and look at the stars and snow on the trees.
Well, it is a great experience even in the daylight. (That is why we booked our 30 min. even for next morning :-) But in the night, when the temperature goes down below zero, you take your shower, run to the pool, enjoy your sake and the special atmosphere and after that put on the yakuta (which is provided by your ryokan) and without feeling any cold, slowly go back to your ryokan and your room. All your body is very warm and your spirit is on top! You continue enjoying this special evening by drinking more sake in your room while you sit on a small pillow on the floor covered by tatami and watch some Japanese TV program!
It is a wonderful alternative to going out, beleive me...
Dress Code: No clothes at all, he-he... But an orderly shower required as you must be very clean before going in into onsen.