We walked down to the port at Kilchoan, and while waiting for the boat enjoyed watching Meadow Pipits, Rock Doves and whatnot.
Lunga is a small, steep-sided grassy island, with no human inhabitants but lots of seabirds, most notably a shedload of Puffins. These were what most folk had come to see - many for the first time and there was much excitement on board.
The boat crew grabbed a floating pontoon and we towed it to the rocky beach. Getting across that was a trial (VERY uneven and slippery). Then there was a very, very steep loose-gravel path up to the high grassy bits. Once we got up that, we were in Puffin City.
Here's a shot of it from a Staffa Tours boat, anyway.
Staffa itself, a larger island with a grassy top and undulating profile, didn't have a lot of wildlife - a few Shags and Fulmars on the cliffs... but we passed a pleasant hour yomping across it.