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Best answer
11
Orange-flag Chao Phraya Express Boat from Saphan Taksin (BTS Saphan Taksin pier) — pay on board 16 baht, hop on/off at major temples. No blue tourist boat unless you want commentary (150 baht). Route map at pier — flag colors matter (orange = express, no flag = all stops slow). Grand Palace stop Tha Chang, Wat Arun stop across river. Mind the gap — boats move. Last boats mid-evening.
6
Orange flag = local express, 16 baht, announce stops in Thai but icons on map.
3
Download Chao Phraya boat map PDF — saves pier panic.