There is an EXCELLENT MBA program - in English - at Chulalongkorn University in Bangkok. The program is call Sasin Institute of Management and is tied in with the Kellogg School and Wharton in the USA - and has visiting professors back and forth.

Bangkok University has several all English programs and numerous universities around the country have English-medium graduate programs.

Prince of Songkla University, just as one example has an MBA and Hospitality program in English. My guess is that the hospitality program, based on Phuket, is probably fairly decent. Probably not up there with UNLV or some of the Swiss schools - but probably fairly decent for someone wanting to get their feet wet internationally. The location affords the opportunity for internships at a quite a few first class - and a couple world-class - resorts in the area.