My husband and I will be going on Regal Princess in May on the Eastern Mediterranean cruise. Ports include Corfu, Istanbul, Mykonos, and Athens. As this is our first time to the Mediterranean, we are not sure whether to join the ship's excursions or go on our own to explore the ports. We want to get the maximum experience at each port. We don't speak Greek or Turkish ~ the ports are completely foreign to us. What is everyone's thoughts?