The radio commercial starts off with pleasant, whistling sound. The announcer comes in and says, This is not a whatever, it is not a whatever, nor a whatever. (I don't recall the exact examples.) He then says, "This is a whistling tree frog." And it turns out he is using it to exemplify the virtues of the island of Barbados.
I have been to the island, and it is filled with beautiful beaches, natural wonders, flora, fauna, animals, food, sunshine, caves, underground lakes, and warm, friendly locals. And of all the things they could think of to attract me and my dollars to their island, rather than all the other vacation choices, was a tree frog? Nah.
UPDATE: Listened to the radio spot a few more times. I now realize that the announcer is saying that this is not a bird, or piped-in music, or a boom box, or the crowds, or the engines of a giant cruise ship. So the point is that you don't hear the normal vacation sounds in Barbados. Or maybe that it is still quiet enough there to actually hear the frogs. Either way, this idea is just making me work too hard to care.
On the other hand, I liked their tag line, "A little harder to get to. And a whole lot harder to leave." Wordy, perhaps, but it was based on, and acknowledged, the truth, was human, didn't scream inappropriately for attention and seemed quite appealing. Now if they could only quiet down those damn frogs.