There is plenty of Temples around Phuket, but if you have limited time, make sure you pay a visit to Wat Chalong, one of the most important and most visited Temple in phuket, it’s quite a pleasant experience to visit this temple. And while in the Chalong area, you should not miss Big Budda, overlooking a large part of Phuket, it’s a nice ride up the mountain and you will enjoy great views on the way.
One should not leave Thailand without seeing a couple of matches of Thai Boxing (Muay Thai), there are regular events in Phuket Town, at Saphan Hin Stadium. Or if you are staying in Patong, you have a few places that arrange matches more or less daily.