I was just down in Kalamata (and Costa Navarino) two weeks ago - there are almost no migrants down in that area - it is, as CWS and CatchThePigeon have said, about as far away from the crisis as you can get here in Greece. Pylos and Methoni are absolutely amazing, if you're looking for coastal places to visit and Ancient Messini is one of the best preserved and undervisited ancient sites in the country. You will have an absolutely wonderful time. And if you're going to Costa Navrino - the resorts there are beautiful. And yes, both the olives and the oil were incredible. I highly recommend it.