I've taken so many incredibly memorable trips since moving to China, but I have to say the one that takes the cake would be my trip to Malaysia.
I usually like to do research and a lot of planning for vacations, but for Langkawi - all I booked was the flight. I think that's what makes this trip so memorable. Riding around the island on the back of a scooter, wind in my hair, wild monkeys in the street, waterfalls, and stopping at small local restaurants made for an epic adventure sans schedule.
For me, living and traveling in Asia has been an experience unmatched by any other I've had in my life and I'd recommend it to anyone.