Canal boat from Pratunam to Jim Thompson House in 8 minutes for ฿14. Same trip on BTS requires transfers and takes 25+ minutes for ฿45. Boats run every 5-10 minutes 5:30 AM-8:30 PM. Get on at Pratunam pier (behind Platinum Mall). Boats have orange and blue flags - both go to Hua Chang pier near Jim Thompson. Just watch for the splash.