Right, I haven't looked where those buses go, but looking at where you're going to be I can see that Carsingtons good - a reasonable circular walk around the Reservoir with an option to go look at Carsington Meadows, or the southern Edges of the Peak District such as Ilam Hall, or if it needs to be near the main A road hows about going to Ashbourne and having a pootle along the Tissington Trail?