I always go to Romney Sands, just a couple of miles along the coast from Camber. The beach is just as lovely but without all the tourist trappings there (chip shop & a mini-mart only) Always easy parking and beach not so crowded. My opinion, the best beach on the South-east coast. :-)
Another vote for Minnis Bay, always went there as a kid and now take mine. Botany Bay very nice too. Do a google image search for Botany Bay Kent and it'll brighten your day.
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Oh yeah, St Mildreds Bay, Westgate is good too