I have lived 15 mins either side of Camber, in both Rye and Lydd.
The beach there is lovely, but there really isn't very much to do at all in the town itself. There used to be a Pontins there, not sure if it's still there now, but other than a few small shops/arcade, there isn't much.
Hastings is about an hour away on a bus and there is more to do there. Rye is also quite nice.
I wouldn't choose to go there for a holiday tbh, but I know people who have stayed at the caravan site and liked it. If you have a car and don't mind travelling a bit, it will be better. There's quite a lot within a couple of hours such as Longleat, Leeds Castle, Drusillas, Port Lymme and Howletts Zoos, Rare Breeds farm near Ashford etc. There's also the Romney Hythe and Dymchurch light railway, which is like a mini steam train and the kids might like it.