From: http://www.kilian-nakamura.com/blog-english/index.php/tokyo-summerland-wave-pool-manages-to-fit-in-some-water/

"It’s summertime in Tokyo, and since we’re in the middle of the Obon holiday week a lot of Tokyoites have left town for the countryside, leaving a strangely empty city behind. Those who stick around or come in from the countryside pack just about every tourist spot to the gills.

We went to the Tokyo Summerland today to catch some sun, and could barely move! Believe it or not, the picture below is of a pool...and not just any pool, but a wave pool! It was broken until 3:00, and when they announced it was starting again, the following craziness happened. If you get motion sickness easily, please do not watch this video."