You are on the same cruise that we were on last Oct (only ours was 13NT). You can walk from the port area to the church and on to the Castello. Not a bad jaunt, somewhat steep in a few areas, but not bad overall. Some very beautiful vistas along the way.
You might also want to consider a bus ride to Santa Margherita while you are there. About 20 minutes. Great little town to walk around in. go to www dot ftroute dot com and click on cruises, find our Italy and Croatia review.
Radiance of the Seas - Nov 2006
Legend of the Seas - Jun 2007
Costa Fortuna - Mar 2008
Legend of the Seas - Oct 2008
Celebrity Constellation - July 2009
MSC Orchestra - Jan 2009
Navigator of the Seas - March 2009
MSC Poesia - November 2009
Jewel of the Seas - June 2010