1) Surprised no-one has mentioned Rowtor Rocks. !
For me it's a must see when in the area, and a great place for a lunch stop.

2) Hordron Edge.

3) Big Moor, Making sure to take in those wonderful kerbed cairns between BB 1-2, And then back down the moor to the path to see the stone row on the way to spend an hour seeking out BB3.

4) Stanton Moor, So many circles so close together, It would be rude not to. !

Only one choice left, hmmmm ?, Would have to be one of the henges, I'd probably visit The Bull Ring over Arbor Low just for the simple fact you'll probably have it all to yourself.