After visiting Loch Lomond, we continued on to the Isle of Mull for several days. My parents wanted to visit a Scottish isle, and we chose Mull for several reasons: it was close enough for a relatively short trip, it offered numerous attractive walks, and we could make a day trip to the nearby Isle of Iona.
We didn’t take a car with us to Mull, so our visit only included places we could reasonably get to by foot or by bus. After taking the ferry from Oban to Craignure, we scouted out our hotel and realized there was a walking path from the ferry and bus terminal, around the bay, to our hotel.
After some lunch and a break, we set out for our first island walk. From Craignure, we walked to Torosay Castle, out to a bay looking out toward Duart Castle, and along the marshy coastline back to the start.
The next day, we crossed Mull to catch another ferry to Iona. We started at the ruins of the Iona Nunnery and out of town past Iona Abbey. (We planned to return to the abbey for a visit after our walk, but ran out of time as we had to catch the last ferry of the day back to Mull.) On the north end of Iona we visited two beaches (Traigh Ban and Traigh an t-Suidhe) before continuing around the west side of the island for a wilder and more challenging trek.
On our last day on Mull, we headed north to Salen to take a walk up to an iron age hill fort at Cnoc na Sroine. Along the way, we stopped to find a geocache at the site of two abandoned fishing boats. After seeing the hill fort, we got a view across the island at its narrowest point — looking west toward Killiechronan and back east toward Salen — before descending through the woods.
The next day we said goodbye to Mull and took the ferry back to Oban, where we caught the train toward our last stop in Scotland.
Expat Linguist 
Mull is definitely in contention for my next Scottish trip. I’ve been reading about the history of Iona. Would love to see that as well.