Ah, Rhosilli Bay! I was brought up in the Gower (in Southgate, overlooking Oxwich Bay), and have walked, cycled and driven over most of it, and sailed round most of the coast and bays. And the run over Cefn Bryn on a quiet day
Going east just after the top there was a great "whooo" or what my wife calls a "tickle tummy brow" - where the car goes really light if you hit it at speed - which I used to love introducing to unsuspecting passengers.