Ride the whole city wall, and start from the South Gate late in the day

The loop is fourteen kilometres of flat brick with the old city on one side and the new one on the other. Bikes are rented at the gates with a deposit and a time limit; two hours is comfortable for the full circuit with stops.

Go in the last couple of hours of daylight: cooler, emptier, and the towers light up as you finish. The surface is uneven in places, so keep both hands on the bars and let the tandem crowds pass.