Where else can you ride a Formula 1 track for free on a weeknight, spin past dunes under solar-powered lights, and finish the weekend on the climb?With the cool season here and a brand-new velodrome due to open in December, this is the best time of year to get out on two wheels.Here are the spots worth your time, from family-friendly loops to a genuine mountain test, with the practical details checked against current sources.Abu Dhabi's unlikely…