We used the Calmac ferry from Oban to Craignure. The journey takes 45 minutes including loading and unloading which is really quite efficient. You do need to arrive 30 minutes ahead of time. The crossing was smooth and the late afternoon light on the mainland was magical. The ferry itself has a bar, café, shop and allows dogs so has everything you need for a happy transit. In the winter the ferry runs about 5 times a day and we took the 4pm crossing. It costs about £26 each way dependent on your vehicle and number of passengers. The ferry is larger than expected and holds up to 70 cars and around 900 passengers.
This particular photo shows Oban as we left the port. The amphitheatre at the top of the hill is McCraig's tower. Started in 1897 and completed in 1902. As you can see John McCraig admired the Coliseum in Rome. He built this as a monument to his family and to provide work for local stonemasons. It is 200m in diameter and has 94 arches in two tiers. It was designed to be more elaborate
but when McCraig died in 1902 construction was stopped with just the outer walls completed.