A male person damaged the exterior awning of the Hean in Saundersfoot by swinging from it at approximately 8 pm on Saturday.
The male was topless at the time and in the company of several other males who then left the area.
Anyone with information is asked to contact PC 1045 Alex Jones at Tenby Police Station on 0845 330 2000 or Crimestoppers on 0800 555 111.