Bangkok University (BU)

Avoid Thailand and do your exchange in China or Hong-Kong if you can. If you have to, go to Bangkok University if much more professional and located near Ekkamai BTS (skytrain station) which is central Bangkok. If you have to do Thailand and Bangkok, pick Bangkok University instead. People are actually more professional there, more exchange students, and administration is much more competent.

ninguno

Siam paragon Mall. Good BTS (skytrain) and MRT (underground). It's extremely difficult to get from point A to point B because Bangkok is heat and concrete. Traffic jams. You may underestimate this because there's plenty of transport (which is damned expensive btw!) but heat sucks the life out of you.

Snotty and vapid Thai students. Group work is definition of hell. If you do well, you make someone else "lose face". Petty backstabbing and gossiping. Your conversations will be basic. Even though Thai students know English, you'll tire quickly of hearing them brag where they lived or studied. You'll have to experience for yourself how utterly vapid this is.

You get what you pay for in terms of quality. Not a lot. Why not study in Beijing, Shanghai or Hong-Kong? You're not allowed to work nor volunteer. Good luck securing some sort of United Nations internship because most of things in Thailand work because of connections. You, presumably, a Western person won't have high status in Bangkok. If you want to have a great exchange, I would advise Shanghai, Beijing or Hong Kong. I don't know who goes these days in Bangkok to forge friendships and create life-changing experiences?