Park on the Snake Summit and follow the Pennine Way onto Bleaklow for 2 miles, then break off right along the vague trackless ridge for another 2 miles, passing Bleaklow Stones, then the Grinah Stones will be seen off on the right. Be prepared to feel lost.
Alternatively, during midweek, approach from the Derwent Valley by turning north off the A57 by the reservoirs. Park on the second, long, sharp right-hand bend from where the approach path starts. Follow the path up through the trees, past a couple of zigzags, then onto the plateau. The good path continues straight on but break off left and head for the stones (visible from here).