Looking for recs of a minibus/taxi tour of Corfu

We'll be stopping in Corfu as part of a Med cruise this May. I'd love to get a recommendation of a tour operator or taxi service that would take us on a tour of Corfu. We're not a big fan of large bus based tours so something smaller in a minibus or even taxi is much preferred. Also, if we go the taxi route, I've found some taxi/limo services that do custom tours of the island but don't list prices. Any experience what a half day or almost full day excursion would cost? We're in port from 8-6 so that gives us a good amount of time on the island. From the looks of things the beauty of Corfu lies in its countryside and not in Corfu town itself. Any help would be MUCH appreciated.