Storage at port

In March, we'll be staying 3 nights at Mary's Boon prior to a 13 night cruise from St. Martin to St. Lucia. I'm wondering, but not too hopeful, if there's a luggage storage facility at the port so we can stash our bags for several hours. Given our short time on the island, I'm trying to fit everything into a short window, and Sunday has us eating lunch at Yvettes. I certainly don't want to keep our bags in the rental car, nor do I really want to stash them at MB, and have to backtrack to retrieve them, so I'm hoping there might be some storage facility at the dock. Does anyone know if there's short term storage options near the dock (the cruise line has none)?

I would say the answer is NO. Honestly, why don't you just eat at Yvette's a different day, and then stay at MB on your last day until it's time to head to the port? Seems like a lot less complicated..