Am sure that this has been done to death but please bear with me...
1)NOT FRANCE!!! Been far too many times.
2)The budget must include transport and self catering accommodation.
3) Must have a pool, preferably a waterpark.
4) 10 days to 2 weeks duration.
5)Travelling from York - do not want to be stuck in a car for two days to get to destination.
6) Two bedrooms are a must.
I've got three ideas myself but thought I'd ask for the collective wisdom of Mumsnet to see if there are any fantastic ideas that I haven't considered.