we did the med renaissance last october-same itinerary!
monaco- we did ourselves, 5 euros return on the local train(where staion is just 10 or so mins walk after your tendor trip to shore), took us there, brill, saw all of monte carlo , alot cheaper to do this one this way than the excursions.
we only paid for pisa excursion + rome as these are further away to do independantly.
you dont have to book the full excursion in these 2 either, they offered one which was simply coach transfer to the centre of these places + you are given a meeting point and time for the return coach, so it was affordable way to get to the places that you may not feel so comfortable doing completely independentely.
corsica-you can walk off-shore and catch a little tourist train along the coastline.
mahon-we just walked off-shore to the town.
have a fab time! its a lovely itinerary.