Galapagos. Please.
That's on my wishlist, but the cost and logistics will be incredibly prohibitive. I've done a lot of research and it seems to be too much effort for too little gain. For example, we'd need our own boat, as the regular ones only go on shore during bad light (i.e. middle of the day).
Antarctica please.
THIS is my ultimate goal. Unlike the Galapagos, this will be worth the cost and effort. Certain aspects are even simpler, such as the ships being geared to and scheduled with photographers in mind.
But gosh will it be expensive
.