@ redjedi - If I knew how to I would...
As you ride up Six Hills Way you go through the valley - there's a bit with lots of grass on either side of you, and a bit of a down and then up. Take the little road on the left at the top of the up bit, and follow it along to where it ends at a small car park by a sailing lake. The cafe is in the building by that car park.
Or you could follow Topcat!!