Depends on if you're burning more calories than you're taking in, ultimately.
Walking is one of the things I really ramp up on when the pounds start creeping back. I lost about 10 lbs. last year on a trip to Chicago because we were literally walking miles a day (sometimes 8-9) despite the fact that I was eating mostly hot dogs and pizza (I love Chicago).
Muscle mass is a contributing factor as well--if you have more muscle mass, you're going to burn more calories. I'd say walk, but also incorporate some resistance exercise into your routine. Even something as little as a half hour of yoga every day with some push-ups, squats, and core exercises thrown in can help a lot. This is all stuff you can do while watching television or whatever.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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