I spent a day (off of a cruise ship) on Corsica in April, so can only give a quick impression. The populated seaside areas were attractive, but will almost certainly be wall to wall people come summer; I was there before everything opened up, so it was very quiet. The mountain areas are spectacular and sparsely populated. I think they were as high as nine thousand feet; very steep, with heavily wooded slopes up to a high alpine zone. I took a bus tour that went from the port at Ajaccio, up into the mountains to an area of granite cliffs that go down to sea, called Les Calanques. Some beautiful vistas but the roads that I was on were very narrow and windy, with no shoulder and some bus traffic; not many places to stop for pictures. Overall impression was a beautiful place with an interesting history; another place that I'd like to get back to, and stay awhile.