Regarding Thailand, I’m not familiar with any islands that are beautiful and not touristy. Phuket has beaches all over the island and many of them are isolated so the only guests are those staying at the resort in front of them. If you search other travel sites, including travelfish.org, which I think is the best site for southeast Asia and it’s run by a friend of mine, you can find more information about more obscure Thai islands. One challenge could be that you might have to take two or three total flights and then a ferry ride to reach them.
Sri Lanka could also be great, and it’s very different. In fact, you might even consider a trip to India itself, which is obviously similar to Sri Lanka. But Sri Lanka is far easier to do in about 12 days, with most of your time spent in the mountains and a bit along the southern coast. Colombo is mainly just good for flying in and getting your bearings. Sri Lanka is also a bit more expensive than Vietnam, but both are great value. And again, you could instead go to Kerala and Goa in India on a short trip, although those are more about relaxation than culture. Let me know if you have any other questions, and I hope this helps. -Roger
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