The National Trust Tours brochure for its upcoming Odyssey of Ancient Civilizations - a seven-night cruise through Italy, Croatia, Montenegro, Albania and Greece - advertises an "all-inclusive" itinerary. And indeed, the $4,195 price for an ocean-view stateroom covers meals, tours and "enhanced" services, such as a flight insurance policy.But a closer look at its catalogue suggests that one or two items are left [...]