Phuket City & Elephant Trek king tours cover most of what is of interest in Phuket island sightseeing. From the various view point you can see Phuket Town, the beautiful beaches and islands and the Big Buddha statue built on top of the highest point in Phuket that overlooks the entire Island.
The Elephant trekking tour is a really marvelous experience and lets you live out some of the adventures and you might have seen Tarzan doing on TV.