Day trips and tours form Oban to the islands are hugely popular and you must at least visit Mull. For operators and timetables –
To Mull – Calmac Ferries
To Iona – Staffa Tours
To Staffa –http://www.staffatours.com
To Colonsay – Calmac Ferries
To Teshnish - Staffa Tours
Visit Mull - The Isle of Mull has attractions, accommodation, culture, stunning wildlife, including whales Dolphins and the UK’s largest eagle population. Famous for Balamory, a short ferry trip from Oban, best to book ahead in summer.
Visit Iona - The island of Iona, off the west coast of Scotland, is the symbolic centre of Scottish Christianity. Iona has a significant history and a special, spiritual atmosphere that continues to attract and inspire thousands of visitors each year.