At the half way turnaround you turn around, literally, a traffic cone (the Traffic Cone of DESTINY) and go and do the entire thing again. Which gives you the chance to go and do the Burfoot* Slope again.
* Damned autocorrect wants Burfoot to be 'Burnout' - does it know something we only suspect?
Gijima1: That's a bold call! Good luck in the race - I hope it doesn't cripple you for the rest of your visit...
My family and I had a fantastic trip to Sicily a couple of years ago - totally brilliant (Aeolian Isles, Stromboli, Vulcano, then Catania and Etna), Easy-Jet and TripAdvisor cheap and pretty stress free. Loved it! (video: https://www.youtube.com/watch?v=UwkrGzwEfWU)