ON his second visit to Sai Kung in four days, the Governor, Mr Chris Patten, was welcomed as a local at the seafood markets. The warm reception for Mr Patten during yesterday's walkabout belied opinion poll suggestions that his popularity was waning. Typical was the excited greeting extended when he paused to chat after recognising his Sunday luncheon patron from Chung Tai restaurant among the crowd of onlookers, writes Justine Ferrari. Mr Patten said he had enjoyed a very good lunch, ''though smaller than my lunches used to be'', at the restaurant, which he had visited during a private visit to Sai Kung. Even a group of protesters at the King Lam housing estate in Tseung Kwan O failed to dampen the enthusiastic reception by thousands of residents. On his way to visit the King Lam Catholic kindergarten, Mr Patten was presented with a bouquet and a request to autograph a photograph of himself, as well as two petitions relating to different development issues in Sai Kung. One petition from residents waving yellow balloons called for the extension of the MTR line from Kwun Tong to Tseung Kwan O. Another group of demonstrators holding banners declaring, ''God Bless Patten, God Damn Clearance'' presented a petition protesting against the planned demolition of an old village nearby for new housing developments.