Wow, this is a very nice combination of beautiful Japanese scenery and nice beaches. And it’s very near to Tokyo, as I see from the map. I think that in every Japanese province there are a lot of places where you can find the exotic Japanese scenery. I think they try to minimize the distance between people and nature. These “bamboo trails” are so unique and you really cannot see them anywhere else.
Best wishes!
There's actually a direct train from Shinjuku in Tokyo to Kamakura for 1hr so it's really so accessible.
I like the Japanese province so much than the city, although the city also has its wonders. The bamboo grove is small actually, but still it's nice to be there.