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We have travel clinics in my part of the world- they will tell you everything-contact your local hospital. I would add Hep c. I use maladrone for malaria and it may be necessary to get a yellow fever innoculation for some areas.
Having been to Siem Reap, I found the toughest part of the day was going to the Gelato stand. Trade into King D'angkor hotel-it is an rci exchange with a complimentry free buffet breakfast and it has an Olympic pool. It costs a ridiculously low amount of RCI points. Siem Reap is becoming a real tourist town. Of course, go to Angkor Wat- it is one of the new 7 wonders of the world. Getting there might be a problem. PM me if you need info. I have been to SE Asia 4 times in the last 3 years and have yet to get a mosquito bite. Probably worse than all of the diseases is Dengue Fever and there is not much you can do about that.
incidently i usually get a massage almost every day- it costs about $7. Recently (last week when i was in SE Asia) I got a pedicure, manicure, foot scrub and 1 hour oil massage for about $17.00. DO NOT GET A THAI MASSAGE-you will be sorry when they grind their elbow in your back and pull you apart.
BTW as to Bangkok, if all this is concern about going to a 3rd world country, think again. Their major shopping areas will probably be an IMPROVEMENT in terms of selection, cleanliness and presentation on what you have in your city. Just get off at the SIAM Center and Take the BTS and drool at its efficiency, cleanliness and on time performance. We should be so lucky. You can also sample the ethic food at Hard Rock Cafe, KFC, McDonalds, TCBY, Shakey's or Pizza Hut or if you want you can also eat street food and rice and noodles almost anywhere.