Corte-Ajaccio

This route starts from the old capital Corte. The town is worth spending time in especially to visit the old citadel. This route follows the train line to Ajaccio - but don't let that fool you, as the profile shows there's plenty of up and lots of down. It's also the second half of the second stage of the 2013 Tour de France.
An alternative is to take a rest stop at the Col de Vizzavona and cycle back to Corte. This is about 65km and takes in all the climbing as well as adding some in for the return journey - four caregorized Tour climbs in a round trip!