If you are tired of the crowd of central Tokyo, why not take a day trip to Okutama area?
I went both on the same day and the whole adventure took 5h30. I am not familiar to trekking/hiking/climbing mountains but thanks to my buddy, I made it and enjoyed a breathtaking view from the peak. You do not need any special gears for mountains but nice shoes that well grab the ground is a must. If you have a pair of walking poles, it will help you very much.
What you can see from the top is the two different pictures of Tokyo: in a distance, the city part (the buildings of Tokyo and its neighbors); quite close, the nature part (the mountains).
Unfortunately, there is little information in English on the internet about how to get to Mt. Hinode.