Journey completed in October 2009
Take the Ferry to Butterworth. (Free)
Take a bus to Alor Setar (10 Ringitt)
Take a bus into Kuah (5 Ringitt) and get transport to Kuala Perlis. (or get off at the Kuala Perlis turnoff and await a taxi or similar).
Any transport to Kuala Perlis. (Someone gave me a lift).
At the "Satun jetty" (not the main Langkawi jetty ) there is an immigration window. Check out of Malaysia and wait.
As soon a s six or so passengers are ready a "longtail" will take you to Satun in Thailand. This ferry ride to Satun cost Ringitt 20
Clear immigration in Satun and take a local bus or motorcycle into town.
Total journey time about 6 hours and it cost me 40 ringit with a great little longtail journey along the coast. Have the camera ready.
Totally legal and great fun.
Journey may be done in reverse.
