Although not as tall as the Sky Tree, at 202 meters there is plenty to see of the Tokyo Metropolitan area. The best thing is that its free! Usually its not very crowded, and there are cafe's and restaurants that provide coffee or a nice dining experience. They are open from 9:00-23:00, closed on the 1st and 4th Monday of every month.
1-12: Mon-Sun: - 09:30-23:00