Pontin's said it saw an increase in 2009 holiday bookings
Visitor accommodation is to be doubled at the Pontin's holiday camp at Prestatyn in Denbighshire.
Owners Ocean Parcs said the capacity of the Prestatyn Sands Park will reach 7,000 visitors over three years.
It is part of a £5m expansion which the company said will create an extra 300 jobs at the complex and 200 construction jobs.
A spa, bingo, betting and gaming facility, refurbished nightclub and bigger swimming pool are all planned.
Ocean Parcs bought Pontin's, which is famous for its Bluecoats entertainers, in March 2008.
It operate six centres in the UK, although it has announced the closure of its Blackpool site with the loss of 70 jobs.
A spokesman for the company said basic refurbishment has already started at the Prestatyn site and work is to begin next year on improving the facilities.
A planning application for the expansion is also expected to be submitted next year.
The company announced earlier this year it was investing £50m on developing its holiday camps.
Chief executive Ian Smith said it had not been an easy decision to close its Blackpool park.
He said the firm's expansion plans "will bring enhanced benefits to both staff and guests as we develop and grow the business over the long term".