Dylan Efron hadn’t been to the Hamptons before a recent trip … but, it looks like he fit the area perfectly — showing off his ripped bod and big smile in a new Instagram post.

The brother of Zac Efron certainly looked a lot like him in these photos … hanging out on a boat around golden hour with a big grin on his face.

He’s catching some rays in a small white tank top … letting the sunlight frame his face.

The ‘Traitors’ winner also shared a pic from a huge outdoor dinner with a long table … an outing the Kennedys might’ve enjoyed as a group back in the day.