Hakone, Japan was beautiful, despite only spending a night there. The mountains are absolutely lush and the shops along the bus route up were cute and quaint--very traditional, outside of the usual hustle and bustle of Tokyo. Not to mention the ryokan we spent the night in had a hot spring in the room, plus it was where I experienced snow for the first time.
Probably the most memorable night we had over a two week trip, which is saying a lot. We're hoping to spend at least a couple of days there, the next time we visit.