I would say, i have not seen such a beautiful city in my life time. I have been to many places but phuket was amazing, that is why it is famous for its world beautiful beaches. And yes don't forget to enjoy island tours like Phi -Phi Island. Island tours are enjoyable experience. another thing one can enjoy in phuket is Fantasia Show and Cabaret Show. Patong beach is the most happening beach of phuket, where you can enjoy the night life.
Food, sight-seeing and shopping
Thai Food is its especiality, you can enjoy different kind of massage treatments to get relaxed. Main attractions are - Island Tours (PHi PHI Island, Koh Penag, and many more), Big Budha Temple, Golf Course, Sunset Points and Patong Beaches, Cabaret Show, Fantasia Show etc. Shopping is another enjoyable experience. You can shop in Patong Beach Market and some malls.
Activities & things to do
Island Tours is the best attractions.
Travel tips, How to reach, travel warnings etc.
You can take a flight to Bangkok (Swarnbhumi Airport) and then domestic flight to Don Muang Airport of Phuket.