Cross the Chao Phraya into Thonburi and Bangkok drops thirty years. The khlongs, the canal network the city was built on, still carry mail boats, monks and schoolchildren past teak stilt houses, and a longtail boat is the only way in. A canal tour is the single thing we recommend to every first-time visitor, and it comes in three sizes.
Cyclists can even combine water and land on the five-hour bicycle and boat tour, from ฿2,500, which crosses the river by longtail with the bikes on board.
Longtails are loud when the engine opens up on the river stretch and near-silent inside the canals, where the driver idles past the houses. Morning departures get the best light on Wat Arun and beat the afternoon rain in the green season. Bring a hat, and keep your camera ready at the locks where the boats queue: it is the best people-watching in Bangkok.
Read our Chinatown guide if you want to fill the rest of the day on the same side of the river, or see all Bangkok tours for the full catalog. Prices checked August 2026; every tour cancels free up to 24 hours before departure.