Be aware that:

1. Tiny potholes become big problems when your wheels are an inch wide.
2. Motorists don't see you, or care about you
3. There's broken glass everywhere
4. Walking when you get off a bike is tricky enough, running should loads of fun
5. If you've never cycled in clipless cycling shoes (the ones that lock to the pedals) practice before you go out in traffic

Anyway, a good spin out on the bike, onwards and upwards. Total distance covered was 13.6 miles = 21.9 kilometers.