Ask a dozen travelers to picture a cruise, and most will describe the same scene: turquoise water, a swim-up bar, a beach with a hammock. That’s the Caribbean — and it’s a wonderful, well-earned classic. But a few thousand miles east, off the coast of Northwest Africa, another archipelago offers an entirely different kind of escape. The Canary Islands trade palm-fringed beaches for volcanic peaks, tropical humidity for eternal spring, and beach clubs for tapas bars tucked into cobblestone plazas.