There are several things that we could do in Phuket. Since Phuket is an island, we could enjoy many activities in the ocean. Not only that city in Phuket called Patong where it is most developed in the island. In this city, if we visit the main street, we will be able to experience cultural markets and night cultures.
We will be staying around 5 days. In Phuket, the general price of goods are relativly cheaper than USA, we will bring less. Each person will bring about $500 just in case, so in total it would be $2500-3000.