Wat Chalong is well worth a visit, though if you want a quiet time, I would suggest going early morning or late afternoon, as it can be rather busy with locals and tourists alike. It's really the only temple on the Phuket tourist trail, and tours tend to arrive there from 10am - 3pm, although I have been there before 8am and seen bus loads of Thai visitors already! Early or Late - that's the key to avoiding the crowds at any tourist destination in the world!