We, Japanese have a long holiday called "Obon" at the middle of August, between August 10 and 16.
I think this is one of the longest and busiest holidays in Japan.
The majority of Japanese travel inside and outside Japan and most of traffic, sightseeing spot, road, hotel, amusement park and other places would be occupied and very busy at everywhere in Japan.
So there were a lot of people on Shirahama beach today.
I show you the other beach in Shimoda, called "Sotoura" beach….
This beach is located between Shirahama and Shimoda downtown.
In addition, this beach is in a creak, so they don’t have big waves.
This also is a good point for snorkeling, because the water is sometimes very clear.