Welsh 3000s

This route starts from Pen-y-pass and goes over Crib Goch to Snowdon, rather than camping on Snowdon Summit and coming down into the Crib Goch valley. This is probably the simpler route but coming down from the Llanberis track down the stream is challenging but easily done if you take your time. The rest is plain sailing. 
You may want to adapt this route however, depending what time you set off, as navigating around he front of Llewellyn at night may be too tricky. If in doubt, go straight up Llewellyn then follow the path to Yr Elen, returning back along the same path. Will only put three quarters of a mile on your journey and will be safer. If you have light, then skirt along the contours along the front.

A car parked at the end, food parcels hidden at the bottom of Tryfan and Nant Peris will help speed you up, if you dont have a support vehicle.

Good luck, safe walking and get ready for sore knees!!!