A nice trip for a sunny weekend day. Take a sampan from Aberdeen to Pak Kok San Tsuen on Lamma Island (around 100-150 HKD, depending on the number of passagers and your bargaining talent). No need to remember the name as all sampans go there. Then go for a hike. You can either take the relaxed 1,5 h walk through banana plantations, passing a secluded sandy beach. You may stop here and take in the beauty of the place. At the end of the walk you'll arrive at Yung Shue Wan a nice little town with lots of good seafood restaurants. My suggestion is the Rainbow restaurant.
If you prefer the work out hike you can also take the route up to the hill. I was told that the view from up there is very nice. So maybe we gonna make it next time...