Do I need a Single, Double or Multiple Entry Schengen visa for this mediteranian itinerary
 

Hi, My wife and I are Pakistani Passport holders and are proceeding on a twelve night cruise from Barcelona, do we need a Single, double or Multiple schengen visa for this trip.

FRI 06JUL12 No Transfer Guests 1,2
FRI 06JUL12 Sail from Barcelona, Spain 5:00pm
SAT 07JUL12 Sea Day
SUN 08JUL12 Livorno (Florence/Pisa), Italy 7:00am 8:00pm
MON 09JUL12 Civitavecchia (Rome), Italy 7:00am 7:00pm
TUE 10JUL12 Naples, Italy 8:00am 5:00pm
WED 11JUL12 Cruising Strait of Messina 1 6:00am
WED 11JUL12 Messina, Italy 8:00am 5:00pm
THU 12JUL12 Sea Day
FRI 13JUL12 Nafplion, Greece 2 8:00am 4:00pm
SAT 14JUL12 Katakolon, Greece 8:00am 5:00pm
SUN 15JUL12 Kerkira, Corfu, Greece 8:00am 5:00pm
MON 16JUL12 Dubrovnik, Croatia 7:00am 4:00pm
TUE 17JUL12 Venice, Italy 3 1:00pm
WED 18JUL12 Debark Ship Venice, Italy 6:00am
WED 18JUL12 No Transfer Guests 1,2

This is not my specialty, but my guess is at least double since you are leaving Schengen to go to Croatia and then returning to the Schengen area for Venice. But this is something you should clarify with your travel agent. Are you leaving from Pakistan or some other country? Are you going anywhere else before or after your cruise?