KUSADASI -- Kusadasi is the HASSLE Capital of the world so do yourself a favour and avoid going into town and have a walk along the shore by turning left as you leave the port and keep going.
PIRAEUS - Mainly an industrial port so go out the port and continue to walk to the left for about 10 mins past the tour buses, Wally train and taxis and you will see a church type building on the opposite side of the road. Cross the road and pass to the left hand side of it and up the small hill, walk for about 10 mins and you will come to a lovely marina area. Allow at least 1 hour for your return to ship.
More 
