I have just returned from 2 week caribbean cruise. You can get a taxi for the whole day for about 100USD on most of the islands and this price is for the car and driver so several people can travel together for that price. You can select the places to visit. Eastern Caribbean dollers would be useful to get a better price on your local souvenirs. If you are visiting Dominica and you would like an extra special visit to the last remaining indian tribe, non touristic place, then contact Michael Eugene at firstname.lastname@example.org, costs about 70USD per adult for a really great and unforgettable day, tell him samantha sent you.