Visiting Tokyo Tower offers unparalleled views of the city and is a treat to behold for those who are visiting Japan for the first time. While the views on a clear day let visitors see even to Mt. Fuji, going at night is much more recommended as you can see Tokyo lit up and stretching to the horizon. Another benefit of going at night is that you will not have to contend with tour groups or the local school children who are there on field trips.
Likewise, if you happen to make it out to Tokyo Tower, stand over one of the windows on the floor and feel some safe adrenaline as you observe the height.
There are also some neat souvenir shops and good restaurants on the ground level, making this a great Tokyo attraction well worthy of the visit if you are in this amazing city.