Hi Mandy,
A bit more info about the supermarkets in Rhyl - Morrisons is excellent for fresh fruit and veg, salads, cheese and cooked meats, also BOGOFs and Asda does the ready meals and pizzas very well.
There is a excellent butcher in Prestatyn halfway up the High Street on the righthand side called Wiford something, and also loads of Charity shops if you run out os something to read.
If the weather is bad, I am sure your children will enjoy the Sun centre in Rhyl, a sort of tropical waterworld with monorail and wave machines.
Have a lovely time,whatever the weather.
G&L