We seen many rays at different spots throughput the VI's. Usually see them buried in the sand with just the eyes exposed
The most memorable sighting we've had was just off the beach on St. Thomas of a Spotted Eagle Ray with a 6 foot wing span. It slowly swam under us in about 10 ft of water and we kept up with it for a minute or two, was simply magnificent.
Hope you get to experience these beautiful creatures on you trip.