Camping around Sydney over New Years

I've been talking with my girlfriend about going camping over new years eve, but as we are both quite new to camping we were unsure about what would be a good campsite over new years.
Ideally we could find somewhere which is within a few hours of Sydney, and somewhere which is reasonably accessible (don't mind a short hike). Somewhere which wouldn't be too busy, or at least have some space where we can pitch a tent
We were originally considering doing the hike from Bundeena to Otford but I know that the North Era campsite there is booked out.
Does anyone have any other suggestions as to what may be a good campsite?
Ideally we could find somewhere which is within a few hours of Sydney, and somewhere which is reasonably accessible (don't mind a short hike). Somewhere which wouldn't be too busy, or at least have some space where we can pitch a tent

We were originally considering doing the hike from Bundeena to Otford but I know that the North Era campsite there is booked out.
Does anyone have any other suggestions as to what may be a good campsite?