The campaign, which breaks on January 14, will target Center Parcs' core audiences through a range of mainstream, lifestyle and press websites, including MSN, Yahoo, Virgin, Trip Advisor and Last Minute.
The creative focuses on the range of activities available at Center Parcs and the environment in which they are set.
John Kinder, managing director of Golley Slater Digital, said: "The online campaign is fully integrated with search, TV and offline but will hold the main focus of spend and leads creative direction.
"This is a tailored data driven approach and is the largest online campaign by Center Parcs to date.
"It is a further shift in marketing spend to online and echoes the trust advertisers have in digital as a quantifiable source of revenue."