First timers requiring advice - children

Good evening all

we have just bought our first van and have joined the club!

we are super excited, but have decided first time out we don't want to go too far.

can anyone recommend any sites within 1 to 1.15 hour drive from doncaster, south yorkshire That would also be suitable for our 7 year old (plaground etc) we are only going to stay 1 night.

thank you