That equates to 80 drinks over the course of the average holiday, or well over 200 units of alcohol.
More than a quarter said they ended up drinking three times more than normal.
But 70% of the 3'500 adults questioned by the Department of Health said they plan to make September the new January by cutting back.
NHS guidelines advise no more than two to three units a day for women or three to four units for men - roughly equal to a large glass of wine for women and two pints of beer for men.
Government figures show 10 million adults in England regularly exceed the recommended daily limits, increasing their risk of serious illnesses such as heart disease, stroke, liver disease and various cancers.