Enjoy arguably the best Pad Thai in Bangkok at this famous eatery, open 5pm to midnight, so you may want to swap with later dinner or find a nearby lunch spot such as Sala Rattanakosin (10am-9pm).
Explore the iconic ruins including the Buddha head entwined in tree roots at Wat Mahathat and the impressive prang at Wat Ratchaburana. Open 8am to 6pm.