Насколько я знаю Carnaval в 2010 году в Cредиземноморье не ходит и будет в следующем 2011. Вариантов по средиземноморью дейсвительно много.

Если хочешь американскую то  Norwegian Gem отходит из Венеции каждую неделю к примеру 4,11,18,25 Сентября. 

DAY  DATE  PORT  ARRIVE    DEPART 
Sat Sep 4 Venice, Italy   5:00pm
Sun Sep 5 Dubrovnik, Croatia  Noon 8:00pm
Mon Sep 6 At Sea  
Tue Sep 7 Athens (Piraeus), Greece  7:00am 5:00pm
Wed Sep 8 Izmir, Turkey (Ephesus) 8:00am 5:00pm
Thu Sep 9 Nauplion, Greece  7:00am 1:00pm
Fri Sep 10 At Sea  
Sat Sep 11 Venice, Italy  7:00am 

 Norwegian Jade из Барселоны каждую неделю 5,12,19,26 Сентября.

DAY  DATE  PORT  ARRIVE    DEPART 
Sun Sep 12 Barcelona, Spain   5:00pm
Mon Sep 13 Monte Carlo, Monaco  10:00am 7:00pm
Tue Sep 14 Florence / Pisa (Livorno), Italy  8:00am 7:00pm
Wed Sep 15 Rome (Civitavecchia), Italy  8:00am 8:00pm
Thu Sep 16 Naples (Capri), Italy (Pompeii) 7:00am 7:00pm
Fri Sep 17 At Sea  
Sat Sep 18 Palma de Mallorca, Spain  6:00am 6:00pm
Sun Sep 19 Barcelona, Spain

Вариантов по средиземноморью дейсвительно много. Выше написал 7 дней а есть 8-13 DAY DATE PORT ARRIVE   DEPART Tue Sep 14 Venice, Italy Embark Wed Sep 15 Venice, Italy 8:00am Thu Sep 16 At Sea Fri Sep 17 Athens (Piraeus), Greece 9:00am 6:30pm Sat Sep 18 Ephesus / Kusadasi, Turkey 7:00am 1:00pm Sun Sep 19 Istanbul, Turkey 8:00am 6:00pm Mon Sep 20 Mykonos, Greece Noon 7:00pm Tue Sep 21 At Sea Wed Sep 22 Naples / Capri (Sorrento), Italy 7:00am 7:00pm Thu Sep 23 Rome (Civitavecchia), Italy 7:00am 8:00pm Fri Sep 24 Florence / Pisa (Livorno), Italy 6:00am 7:00pm Sat Sep 25 Monte Carlo, Monaco 6:00am 2:00pm Sun Sep 26 Barcelona, Spain 5:00am
и даже больше 20 дней.
Один из вариантов 20 nights departing September 8, 2010 on Holland America's Noordam
ITINERARY
DAY DATE PORT ARRIVE   DEPART Wed Sep 8 Rome (Civitavecchia), Italy 5:00pm Thu Sep 9 At Sea Fri Sep 10 Dubrovnik, Croatia 8:00am 6:00pm Sat Sep 11 Corfu, Greece 8:00am 6:00pm Sun Sep 12 Olympia (Katakolon), Greece 7:00am 2:00pm Mon Sep 13 Santorini, Greece 8:00am 9:00pm Tue Sep 14 Ephesus / Kusadasi, Turkey 7:00am 7:00pm Wed Sep 15 Athens (Piraeus), Greece 8:00am 6:00pm Thu Sep 16 At Sea Fri Sep 17 Messina, Sicily, Italy 7:00am 1:00pm Sat Sep 18 Rome (Civitavecchia), Italy 7:00am 5:00pm Sun Sep 19 Florence / Pisa (Livorno), Italy 7:00am 8:00pm Mon Sep 20 Monte Carlo, Monaco 8:00am 5:00pm Tue Sep 21 Barcelona, Spain Noon Wed Sep 22 Barcelona, Spain 11:00pm Thu Sep 23 Palma de Mallorca, Spain 9:00am 6:00pm Fri Sep 24 At Sea Sat Sep 25 Tunis, Tunisia 7:00am 6:00pm Sun Sep 26 Trapani, Sicily, Italy 7:00am 6:00pm Mon Sep 27 Naples / Capri (Sorrento), Italy 7:00am 6:00pm Tue Sep 28 Rome (Civitavecchia), Italy 7:00am