Just wanted to make a recommendation for union lido near Venice Italy, its my first time in Europe and I've wimped out a bit with a static rather than proper camping, but this really is the best site I've been on in my life. Great pools, great beach, amazing shower blocks with nursery area in each with dinky showers, baby baths etc, 4 massive play areas, loads of restaurants, 2 supermarkets and its so amazingly clean. 1.20 for an icecream its not expensive either and they do all sorts of camping from permanent canvas tents with aircon to a basic pitch with hookup.
It has cost £1300 for 2 weeks for a 2 bed mobile home, 3 bed was 1800, that's mid August prices. We have flown here, all we needed to bring was clothes and pushchair, everything else is here to either loan or hire. Flights were about £120 pp with 20kg hold luggage included. It's not the cheapest holiday I've been on but its certainly been the most enjoyable one, and the most relaxing, despite being on my own with 2 kids and a baby!