During your trip from Pattaya to Phuket, you will have the chance to drive along the Gulf of Thailand (East coast) and the Andaman Sea (West coast). The Andaman Sea is part of the Indian Ocean. From Cha-Am (or Hua-Hin ) to Krabi you will have a long stretch of about 7-8 hours to drive. It doesn’t really matter because on your way the view is splendid and the beaches are superb.