We went to South West Rocks last year. It was lovely.
I love the Snowy Mountains.
I also like Lennox Head.
TBH it doesn't really matter where I go - anywhere that my family is staying is my favourite place. We try and go on holidays together and rent flats or houses next door to each other. My children love spending time with their aunts and uncles and cousins.
I've been away with my ILs before and it was awful - just like being at home with them so I would also say anywhere that my ILs aren't :P