Trip to Kawaguchiko
I visited the Lake Kawaguchi (Kawaguchiko) last weekend with one of my best friends from Sakura House☆

Can you see the beautiful mountain behind us? (I know there is too much backlight and it is hard to see it...)
It is Mt. Fuji, and my only purpose of visiting the lake was to see the mountain.
When our guests ask us for a good place to see Mt. Fuji, we usually recommend Kawaguchiko. One reason is the easy acess from Tokyo. There is a highway bus from Shinjuku going direcly to the lake, which only takes 1h 50min. Why don't you go there for a day trip?
There are many nice restaurants of houtou around the lake.

Houtou is one of the most popular local dishes of the area. It is miso-based soup with udon noodles and lots of vegetables. I tried this restaurant and loved it! We walked 20 min. to the restaurant because we didn't have a car, tired... but it was worth doing that!