Boat from Marseille IS good , Toulon is definitely the nicest way to reach Corsica.
You will dock at sunrise refreshed
Lots of people sleep on a mat, regulars claim thé nicest spot early
Thé main roads are mentals, it pains me to admit that dangerous driving is commonplace.
You can skip all the mayhem using thé train southbound.
Inland if you want to fight the mountains.
Grany Gears compulsory.