Some very nasty approaches, and runways can be found on many of the Greek Islands.
Islands like Mitilini and Chios have only a runway under 1500m..... There is not much room if you need a minimum of 1200m or 1300m to land
, on most of the charterplanes (depending on the weight). Even if you float a little you might be ending up with wet feet, or of the runway. I consider those as most challenging...
Others like Iraklion have a bit of a longer runway but have very limited approach facilities. In Iraklion you make a non precision of-set approach coming over the water, which on short final takes you dangerously close to a mountain ridge. At night the approach is even more challening because of the limited lightening system of the airport.
I do agree most of these destinations have beautiful weather during summer, and often you can make a visual approach, but even in these months they can be very nasty.
A third difficulty is the terrain. Some airports have long runways, equiped with an ILS and full light facilities, but the approach takes you over (very) high terrain.
Some airports in Turkey are very known for this...
Antalya, Dalaman, Izmir... sometimes the approach controller provides you with radar vectors there, but letting you descent way too early, a real hazard for CFIT (Controlled flight into terrain) One mistake could be fatal.