My favorite place would be mountain peaks or near it!
It's the one place away from the city and it's pollution, with a gentle cool breeze. It's the one place you have to work for (you sweat to reach it) yet it's also the most satisfying, stress-relieving place to be.
My favorite place to travel is just right here in the Philippines, Boracay, white sand beach, first class hotels where you can really unwind, relax and have some fun.