Holidaymakers to some of Otago's most popular beaches this summer will be asked to stub out their cigarettes and stop vaping.

A three-month smoke-free trial starts next week at the main beaches of Queenstown, Frankton, Wanaka and Glenorchy.

The Queenstown Lakes District Council decided to set aside $5000 for "ambassadors" to "educate" those flouting the ban as well as signage. "Should a smoker invoke their right to continue to smoke they can do so with no further implication," council corporate services manager Meaghan Miller said.