Wat Pho, The Temple of the Reclining Buddha, is one of the oldest temples located in Bangkok. It is famous for the 150ft long golden Buddha statue (the largest in Thailand) that resides within its walls.
You have to remove your shoes before you enter the Temple, so wear easy to remove shoes. Also, women must be covered. No shorts or shoulders showing.
One can also visit the legendary Wat Pho massage school for a relaxing massage.