We are in the final planning stages of our trip to St Croix for this July. I realize no passport is required, just photo ID, i.e. driver's license, state ID, however, what about our 13 year old daughter? Obviously she doesn't yet have a driver's license and we have had no reason to obtain any kind of state ID for her. Does she need any proof of US citizenship to get back to the mainland from St Croix? We usually go to the gulf coast of Florida every year and she has not had to submit any type of ID yet, so not sure if this would be just like flying to Florida as far as she goes.