Like someone mentioned earlier there should be plenty of taxi's around when the cruise ships are in port. Just hang a right after leaving the port area and you'll see the area frequented by the taxi drivers. Last time my wife I did this I believe it was $25 USD one way to Orient Bay. But, as noted if you get another couple to ride along with you the rate will be reduced. The trick will be getting to Grand Case from Orient Bay. It's too far to walk, so I would suggest carrying with you the phone numbers of two or three local taxi services when you want to leave the Orient Bay area. Once in Grand Case, if you decide to have dinner there, the restaurant can usually arrange for a taxi for you to return to the dock. This is a lot to do on just a cruise ship stop so it will be necessary to manage your time carefully. But, my best estimate for these three taxi rides would be roughly around $75. Hope this helps.