Thailand 2011 Area Description North East (Isan) Udon Thani, Ban Chiang, Loi Central Bangkok, Ayutthaya South Ko Samui Details Between February and September 2011 I've been several times for a longer period in Thailand for business. In addition to my primary destination Udon Thani in the northwest of Thailand (Isan) I've visited also Ko Samui and the Bangkok area.