Once the lights turned on.....it's a breathtaking sight. You can also take a ride on a ferry ride to enjoy Yokohama's harbor. Mind you, the wind is quite strong in this area. Make sure you've dressed adequately.
Minato Mirai 21 is basically the image I have of Yokohama, a beautiful modern harbor city. I loved walking around on the boulevard during the day and then visit the malls (there are a lot of malls here!) for some shopping. Restaurants here are also not hard to find, I think there is something for everyone's taste. Highlight of my day was the night view. Seeing the lights of the city and the ferris wheel with it's rainbow colored lights. A good place for a date in my opinion!