St Martin Luggage Storage

I will be spending 2 nights in St Barth on the front end, of 2 weeks in St Martin in December. I will be flying out of Grand Case and the small plain will not allow 3 large bags. Help, is there any secure luggage space at SXM or Grand Case air ports. I emailed both and got no answears. Taking them to my Hotel in rush hour traffic and making the plain is out. Any suggestions ???