Sometimes you'll want to get away from the hustle n bustle of Tokyo and what better to spend some time in Hakone which is just about an hour away.
Hakone is out in the sticks which means a ton of trees, fields, mountains and a huge lake - Lake Ashi to be precise.
Mount Fuji can be visible clearly when its not too cloudy and when you dont have mud in your eyes. I'm still not sure why folks over here go crazy when they see Mount Fuji - they all start pointing and whipping out their mobile phones.
Spent two days in Hakone recently - the first day had tons of snow but the second day had crisp n cold air with blue skies. You can get to Hakone by taking the Odoriko from Yokohama - its only a 30 min ride.