May is the perfect time though, before the holiday traffic kicks in on the coast roads (the interior roads are always quiet enough). Also before the hornet season, which I call a major consideration.
I once couriered a commercially-run Tour de Corse (Graham Baxter Tours) with 30 riders and just me in the hired white
van lorry. Having ridden it the year before. Some of the coast roads were terrifying on 4 wheels, much nicer on 2!
Rocco Richardson crossing the Col de Vergio (highest road on Corsica)