Hmmmmm, Lars.

I'm pretty sure everything is locked up and closed by then. Get a bite before you leave LIAT originating airport (Sint Martin???) and take something with you like a sandwich, bread cheese (?bottle of wine) or something on the plane so you have a snack once you get to Tortola.

Also not sure what's open in the airport when you arrive late like that. Arriving EIS at 9p, where are you planning on staying that night? I have some ideas if you need them.