The 1.6 km square moated Old City has 30+ temples, traditional shops, cafes, and night markets — all walkable in 1–2 days.
Start at Tha Pae Gate. Walk west through Wat Chedi Luang, north to Wat Phra Singh, east to the Three Kings Monument.
Bike rentals (50–100 baht/day) cover the Old City in half the time.