I went and visited this location to do some detective work and they were filming the day I visited. One end of the caravan park was being used for Home and Away but the rest of the caravan park was open for anyone else to stay. A family that was staying in the park were used as extras for a couple of days!
I asked at reception how often they filmed there but they didn't give much away.
I know people from overseas go to Palm Beach to look at the location there but if you wanted to stay in the caravan park I guess it would just be a matter of luck if they were filming when you were there.
I have put the location on Google Maps. Just do a search for 'Summer Bay Caravan Park Sydney' and you should find it.