You should be able to find a spot on the eastern beach with little noise and few/no sandflies. If you get something a bit further north you can duck over to honeymoon bay fairly quickly, and also duck down to blue lagoon as an alternative for the kids to swim. I'm sure it can get busy in school holidays but north of blue lagoon there are a heaps of spots so there should be something that's ok. Of course the extra surf noise on the eastern side helps take the noise from other campers away too.