I'm the odd man out here. I cycle (road bike) and love it. It also really helps on long-term endurance...and if you try to ride bike uphill, you get an instant incentive to lose weight.

Having said all that, losing weight is a simply proposition. Decrease your calories, increase your exercise. And walking every once in a while won't make that much difference. Walk (or bike) at a good pace for two hours every day...and reduce your calories...and you will be amazed.

No snacks, no "rewards" for having worked hard!