Called "the best crag in the world" by Leo Houlding, Clogwyn Du'r Arddu (Cloggy) deserves a special place in the history of Welsh climbing. It has all-time classics in just about every grade, and is home to famed routes such as Indian Face and Master's Wall. Very long (up to 300m+), mostly serious, routes in an alpine setting. Some loose rock - an integral part in the Cloggy climbing experience.
Drive to Llanberis and go up the narrow road opposite the Royal Victoria Hotel. Park somewhere here - parking is no longer available at Hafodty Newidd as the farmer padlocks the gates. (Thanks for info, Bob Wightman.) You can drive past the Youth Hostel (turn up past the Spar shop) and park in small laybys after the tarmac. Don't block access. A path leads from this track, Bwlch Maesgwm, across the valley to just before Hafodty Newidd.
From Haftoy Newydd walk up the railway and the track until well past Half Way House, and where the track steepens, keep right along the miner's track which leads to the old copper mines, and continues as a small path contouring the cliff. Halfway House is now open for refreshments - though sadly not home-made lemonade, rather a strong trade in ice cream and Slush Puppies.