It's not only the sound of the ocean you'll hear on this private eco-cruise – with luck, it'll be the calling of its marine life, too. Cast off on a sunset trip off the coast of towering Los Gigantes cliffs, and it won't be long before you're gliding in prime dolphin, turtle, and even whale territory. With the help of a hydrophone, you'll eavesdrop on the underwater symphony, from the chatter of dolphins to the echo-location clicks of hunting whales.