I've been to Pontins Prestatyn Sands and it was a dump, the caravan was really horrible. Not even suitable for a dog! That was a few years ago now though so they might have gotten their act together (thought I very much doubt it).
Go onto Google and type in, say, Haven Golden Sands Reviews that should give you a link to Trip Advisor which I always use before booking a hotel or any other place to stay.
HTH Dilly xxxxxxxx