Adults-only, without apology.

An adults-only hotel is, ideally, a hotel where the policy is enforced rather than aspirational. The good ones have it written into the room reservation, not just the marketing. The bad ones have a sign at the pool that nobody reads.

The hotels below are mostly Caribbean and Mexican, with several European and Asian outliers. All have hard-line no-children policies, calm pool culture, and dining-room rules that hold past 8pm.