Chalong beach 

     Chalong is a large bay with a pier that is the main departure point for diving and fishing trips from Phuket. This beach has several restaurants selling some of Phuket's best seafood.
The pier is a good place to charter boats for fishing, diving or snorkeling trips to nearby islands. Chalong Bay does not have a great beach for swimming due to the muddy bottom and large number of boats moored here. Just inland is Chalong traffic circle. This area is popular among expats living in Phuket and there are some good restaurants and bars nearby.

Source from www.phukettourism.org