A slightly more time-consuming journey than some of its neighbours, but Hayama Isshiki beach, aka Isshiki Kaigan (一色海岸) is definitely worth the effort. A beautiful stretch of sand so nice that the Emperor himself has his summer home right on the beach. In the summer there’s a tropical feeling: the police guards pacing the royal beach house walls are not there to stop you drinking beer - or even having barbeques - and seem pretty content to get in the beach vibe.
In the summer (around a week into July) the beach ‘opens’ meaning the standard wooden beach structures we get at the resorts all along this coast appear: bars and places to get simple food. Unlike, for example, the busier Kamakura Yuigahama or Enoshima (which is dramatically visible across the sea) it’s a low-key, quiet affair at Hayama rather than an all-out party. Perhaps we have the royal presence or the extra travel time to thank, but it means getting a space on the sand is possible without too much hoo ha. It also means the sound of nature wins over against human chaos and music. If shade is more your scene, there’s a nice area sheltered by trees, and if you like sitting (or pitching a tent) on green grass there’s even a nice little spot for that.
There’s some really good swimming to be had in the bay directly in front of the Emperor’s house. An artificial bay of flat, calm water, flanked by a large, concrete kind of sea wall/pier and gentle currents