I just got back from one from Cornwall... I stayed in a Haven resort in Perranporth called Perran Sands... I got there and was gutted, they put us in a shitty little chalet which looked like it hadn't been updated since the 80's, and it smelt. No room for travel cot either. I kicked up a fuss with OH and ended up paying £80 for an upgrade to a caravan.
Going to complain to the Sun about the accomodation and having to pay to get a room to fit a cot in, even though they were aware the baby was coming!
It was a good holiday other than that, and alot of my friends have done it and had really good accomodation, so I really think I was just unlucky, don't let my experience put you off! x