Heading to Thailand for 2 weeks at the beginning of august and looking for some suggestions on where to go. We have planned to go to Koh Sumai as the weather isnt meant to be as bad down south. We are beach people but like to do plenty of sightseeing aswell. Would two weeks be too long in Koh Sumai and if so can you suggest some other places worth visiting for a few days. Thanks for any info .