Update on this, went to Ingoldmells in July/August (had food poisoning most of the holiday, so it wasn't much of one for me).
Instead of Prestatyn we went to Pwllheli.
Off to Blackpool with my boyfriend at the back end of October until the start of November. So with this one, he wanted to go to Blackpool as he thinks there's more to do there than Skegness and he liked it when we went last time (our first holiday together, his first time in Blackpool in June 2016). It was really dead at that point, so we decided to book off from 29th October (we're away for Halloween which is great, trick or treating at hotels in Blackpool was good fun as a kid, shame I'm too old now and we're away for his birthday too yay) and I assumed that was when kids went back to school so it wouldn't be as busy as school holidays - turns out a lot of schools have that week off so he's going to see Blackpool like never before .