We are staying on Culebra December 6 -13. Flying in to SJU w/ US Air arriving the 6th at 1:45pm departing the 13th at 2:45pm. We are booked w/ isla nena but have found out now they can't guarantee what the price will be w/ rising fuel costs or that they will still be at SJU in Dec. so they are offering to refund my flights to find another option. Is there a known and reliable way to get there and back that will coordinate with our US Air flight schedule without much delay so we can just get to Culebra without having to hang around the main island for too long??