Open top bus to - Pen-y-Pass - is a mountain pass in Snowdonia, Gwynedd, north-west Wales. It is a popular location from which to walk up Snowdon, as three of the popular routes can be started here. Glyder Fawr, to the north, is also accessible from here. Regular buses to Caernarfon and Bangor The Snowdon Sherpa is a unique bus service that travels around the foot of Snowdon, creating a valuable link between the six main routes that travel up Snowdon, as well as the main car parks, villages and tourist attractions in the area. It is an ideal service for walkers or climbers who intend to start their journey from one point and finish at another, or indeed for anyone who wish to travel around Snowdonia and leave the car at home.