I just got back from a round trip to pick up some cargo between the terminal and sunset beach. $2 each way, air conditioned, and fast. I believe the going rate for a cab is $15 from the SMYC to the airport.
@TJTrippe - Germany doesn't have Uber, and many other countries have banned/restricted these types of carriage systems. There's not a snowball's chance in any of Dante's 9 circles of hell of an Uber getting established on any of the Caribbean islands I've been to. Including the USVI, which is USA-ish.