Bangkok's largest and oldest temple, the Wat Pho is home to more than one thousand Buddha images, including an enormous gold-plated Reclining Buddha which sprawls for some 46 meters across and 15 meters high with mother-of-pearl inlaid feet. Built in 16th century, Wat Pho came to the peak of the authority during the Chakri Dynasty when it was regarded as the most important monastery in the country.
Wat Pho is also known as the birthplace of traditional Thai massage. It houses the most famous traditional medicine and massage school in the country. If time allows, try to get a Thai massage there. There is a working Buddhist monastery and a school in the Wat Po. And it is said that a number of accurate fortune-tellers along the eastern edge of the compound, want to have a try?
Here are some tips for entering the temple: Dress appropriately (cover up your shoulder and knees) but if you don't, they have robes outside for visitors and no extra charges. Shoes must be taken off before entering the inner temple.
Have a look at this itinerary that offers a chance to visit the Wat Pho.