ie. you can open a website to sell cheap/crappy quality made in Thailand things. There are many. Or even through eBay.
Or once you stablished you could sell services to your country people to make them easy a travel here, as resorts or houses for rent, bike rentals, tours, etc…
Don't know, I let you this ideas hanging around your mind.
Another good idea is to teach English to high/middle high class Thai people who want their sons and DAUGHTERS! learn good English (not like mine :P)