Ōiso (大磯) is an unremarkable-looking town in the middle of surf-hotspot Shonan coast, north Sagami Bay, Kanagawa Prefecture. However, don’t judge a book by its cover! This town is a slice of history: established in 1885, it’s Japan’s first ever seaside beach resort.
In reality, sure, it’s a long stretch of dark sand in the shadow of a noisy, grey-concrete elevated highway. There’s no pier, merry-go-round or donkey rides, but it has some charm if you find yourself in the locale.
Some of which is due to the panoramic views. The entire coastline along here has some great views of Mount Fuji (which both explains and possibly makes up for the darker sand?) on clear, unhazy days, especially in the early evenings against the sun, and crisp mornings. Sagami Bay is pretty open and turning the other way, Enoshima and the Miura Peninsula are look nice in the near-distance, too.
The swimming is good, if you are into a bit of turbulence. There are some really big waves here, which make for some fun body surfing, and it’s nice to feel the power of the sea, compared to say, some of the flat beaches of neighbouring Enoshima.