Speaking purely as one who sits in the seats at the back rather than the front, the Greek Islands can be quite interesting as most are fairly small and mountainous and not many flat areas.
Skiathos is quite entertaining with a short runway meaning the brakes have to go on straight away as you land. The runway goes over the brow of a hill so you cant see the other end, and you have the sea at both ends if you overshoot. The best one has to be Samos. The island is an elongated U shape with mountains. The flight path in involves flying round the inside of the U well below the tops of the mountains. We did the trip in a 757 which didn't seem too bad inside, but looks pretty spectacular from the ground as they bank very steeply.