Anyone been to Greece?

Hi...bit off topic but not too sure where to post this - has anyone been to the Greek Islands recently (perhaps mykonos or corfu, Santorini, wherever!) and could recommend a good cheap place for young people to stay? Is there perhaps an area or a backpackers where young travellers notoriously stay and party? We were going to do the greek islands hopping tour but are unsure at teh moment...we may end up doing it on our own after our highlights tour.

Or if you have been on one of the tours that include Greece, perhaps you could give some feedback?

Any advice would be greatly appreciated!