We did an excursion in Athens that did exactly that - drop off at Acropolis - pick up near the Plaka. My guess is the locations vary based on parking availability. Your friend may be able to give you a good meeting place. There is a church at one end of the Plaka with a nice public square and a lot of outdoor seating.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Alaska 2014 - haven't picked a cruise yet
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, Caribbean 2013