Bidean nam Bian is a large and complex mountain and has the reputation as being one of the best of Scottish Mountaineering. Glencoe has some very fine Munros and Bidean nam Bian is definitely one of them. There are several ridges on Bidean nam Bian. Its SW ridge connects to Stob Coire Sgreamhach which is a separate Munro and normally included in the ascent. The Bidean is the highest peak in the area but the true summit is actually surprisingly hard to see at least from the A82 side anyways. It is hidden by what is known as the three sisters. These are in fact just subsidiary peaks of the Bidean's NE running ridges (the first sister is in fact the NE ridge of Stob Coire Sgreamhach). These are probably one of the most famous sights to anyone that drives through Glencoe and is very often the picture people think of when they think of Glencoe.
The route for most will follow the valley between the first two sisters leading to the col between Bidean nam Bian and Stob Coire Sgreamhach. This is a very famous valley know as "the hidden valley" History has it that the McDonald clan used the valley to hide all the stolen cattle as it is impossible to be seen from anywhere unless you actually venture into the valley. Taking the SE ridge from the col will summit Stob Coire Sgreamhach and continuing NW will take you to the summit of Bidean nam Bian.
There are many car parks along the A82 near to the three sisters however in the summer months these can be a nightmare so it is definitely recommended you get there early.