I had the same question when I went to Thailand. Just intend to eat clean and look around, you'll find gogod (if not perfect) food. I could eat clean in Thailand. I live in Korea, and I just had a trip to Hong Kong (by the way, I'm an American not used to being in Asia), and I can always eat clean if I want... just desires the will to eat clean.
I actually found a gym in Thailand and had a few workouts, and did bodyweight exerciese while I was gone (prepared exercises before I left).
Biggest thing though, is just to enjoy your vacation. If lifting right and eating clean makes vacation better, then do it! If not, don't worry for a week. Even if it takes 2 months to get back to where you are now, you'll get back. Health (at least for me), is a lifelong committment. There are setbacks, but every 6 months, I'm always noticably healthier and stronger.