Go to Indonesia. Head to Bali and rent scooters. Go ride the coast and see the whole island. It's stunning and very relaxing, as a vacation should be.
Thailand is a dirty shadow of its former self that is becoming more and more dangerous. It's also the Land Of Scams. The Philippines... unless you go off the grid or to one of the nicer islands, it's a filthy shit hole with dirty kids roaming the streets begging for food and pesos.
Cambodia is cool if you want a little dusty adventure. So is Laos. But skip Thailand unless you want to come for some big city clubbing in Bangkok. It's nowhere near as good of a vacation spot as it used to be. Still a decent place if you know how to not get scammed, but for a first time traveler to the area, I'd choose Indo any day of the week.
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