Chubby Duck Offroad

One run down a freshly dealt mountain — gravity acts as the engine, while your midair rotation is the sole resource you cannot recover. Obey the speed signs, land on the back of every hill, vault over the boulders, and ride the logs as if they were rails. A single wipeout ends the run: reach the finish for one star, pass through every cone for two, and beat the par time for three. How fast can you get the duck down?