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12
Chao Phraya Express orange-flag boat from Saphan Taksin pier (BTS Saphan Taksin) — 16 baht, stops at Wat Arun (Temple of Dawn). Tourist cruise 150+ baht unnecessary. Sunset climb Wat Arun stairs hot but iconic — dress knees covered. Last boats early evening — check return time or Grab back. Combine Grand Palace morning + boat west for Arun 5–6pm. Tourist boat only if you want AC and commentary.
4
Orange flag boat 16 baht — hopped off at Wat Arun stop, easy.
3
ICONSIAM shuttle boat also connects — mall AC break before sunset.