How about "
Munchies" on Koh Samui ?
This resort has beach front chalets, where you open the front door and walk down the steps straight on to the beach.
No guarantee that there won't be kids around, but when I was there, it was not busy and if there were any, they were not noticeable.
Beach is good, quiet and sandy. The pool looks out to sea and can be seen in the pics from the hotel website.
And it's just a 10 minute stroll to restaurants, bars and nightlife.