Wat Pho holds a 46-metre gold Reclining Buddha that barely fits its own hall, and a courtyard complex that stays calm even when the Grand Palace next door is heaving. It is also the traditional home of Thai massage, and the school here still takes walk-ins.
Come in the morning right after the Grand Palace opens and the coaches head there first, or in the last hour of the day. The Buddha hall funnels one way; let a group clear and you get it nearly alone.
Ten minutes on foot south of the Grand Palace, or the river boat to Tha Tien pier. The cross-river ferry to Wat Arun leaves from the same pier, which makes the three an easy single loop.