I bike to and from work. It takes around 40 minutes each way. My route is mostly off road, on a woodsy trail that bends between a canal and the Potomac River. Because I don't have to worry about cars (though are a speeding bikers), I usually let me my mind wander, sometimes watching the scenery, but usually worrying about getting home on time or catching the biker in front of me or relivign the highlights and lowlights of the day.
Today I tried mindful biking, which I've attempted a few times before. When I do walking meditations, I try to start by synchronizing the steps with the breath. That doesn't work on a bike. I had most success feeling my feet go all the way around on the pedals. When I stayed with it, I felt in the moment, noticing the wet lights around me and all the bumps on the road. But it wasn't easy to stay with. I'll keep trying.