Recommendations for sites in France Please

Hi All we wondered if any of you could offer suggestions and advice. We are looking for a site that compares to 4 vents for pitch size, friendliness and cleanliness. Is about 4 hours max from Calais in any direction but preferably in a warm direction! We would like one that isnt like Butlins but with some facilities and is suitable for a July August holiday with a dog. Either a beach location or countryside would suit us. We have been to 4 Vents for the last two years and are looking for a change but as it is our main holiday we dont want to get it wrong as we have had wonderful stays and excellent weather there. We do have to go during main school holidays so would like to book in advance. Thanks in advance for any suggestions or advice.