I have also been to Argostoli. The town is small but there are lots of shops in a street just back from the waterfront. There are also lovely bakeries and tavernas on the water front. There is a small lagoon to walk around where you might see turtles. It is a short taxi ride to nearby beaches and you can also visit the memorial to the Italian solders slain in WW2 (subject of Captain Corelli’s Mandolin).