what other cities in thailand have popular beaches other than in Phuket?

But that is not much of a beach. Why city though? Maybe you should think about Krabi Beach (Ao Nang) or even Hua Hin?

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Lots of beautiful beaches in southern part of Thailand such as Koh Chang, Koh Lanta, Phi Phi Islands, Koh Samui, Koh Muk, Krabi, Hua Hin, Cha Am, etc., etc.