Al Gharia Beach (It even has a beach resort now) which is on the way to Ras Laffan via Al Khor route. Its the cleanest of the lot tht v hav here in Qatar. Also, der is the Sealine Beach Resort down south of Qatar, which for a fee of 50Qar, u cud use the beach and the swimming pool... Der r couple of other beaches on the far north-west of Qatar, but i think 4 now Al Gharia suits u best since u r new 2 town. Enjoi..!!!