The Wat Phra Yai temple is the home of Koh Samui's most famous landmark the Big Buddha. Most visitors will come to marvel at the sheer size and beauty of this remarkable statue at some point during their holiday even if they do not go anywhere else. Visible from several kilometers away and even from the air when arriving on or leaving the island the Big Buddha sits 15 meters tall and was built in 1972 by the local society to give visitors a place to pay respect to The Lord Buddha.
If you want to know more about Koh Samui there are some links here
Amazing Samui for hotels, bookings etc
Koh Samui.org for all sorts of information
Weather in Koh Samui click here (currently around 28 to 30 C)