we are leaving the cruiseship at 8am and need to know if there is somewhere we can leave our luggage as our flight isn't until 5.50pm.
I've been through the cruise ship terminal and don't remember seeing any lockers but there are a lot of souvenir shops and there are police stationed there. It would probably be best to contact the cruise line to find out what's available. If there's nothing formal you might be able to arrange something with one of the shops, especially if you buy a few items in that store ;).
Unfortunately, the Barbados Airport doesn't have a luggage storage, or locker facilities. I would suggest you check with the cruise line you are taking and talk to them about a post cruise transfer to the airport. With this they might take you on an island tour and your luggage would go directly to the airport.