• Getting fit without trying.
• Smelling the world around you. I rode home last night and could smell the frangipanis as I rode along. Ah those summer nights.
• Waving at other cyclists. There are actually a few people out-and-about.
• Picking my son up from school on the tag-along. He gets some exercise, it's great fun and we don't have to find somewhere to park.
  
• It's quiet. I can listen to the world around me.
  
• It makes me feel like a teenager again.

Motorcycling has all those things... except the quiet... but you get that when you stop... and the exercise...

Unless the motorbike breaks down, in which case you get to push it!

I have not ridden for more than a week and feel so slack.

Biking is my favorite form of cardio exercise.  You get many of the same benefits of running/jogging, but it's much better for your knees.