Is it possible to do boris-biking for fun and exercise? I'm visiting the capital next week, and looking for recommendations of very quiet or ideally traffic-free routes in London - central enough to be able to do in a series of <30m boris-bike hires. Hyde Park and Regents Park are obvious options - are there any others?
We've got to get a hire car back to the airport in Geneva tomorrow at 11, but our flight doesn't leave till 4. This gives us 3-4 hours or so to have fun. One of us is 5 years old. What should we do? Cheap is good.