You do nothing for now, you will need it later on in the game. But after you get the key card walk in the museum and there will be a package for you.
It will.
you get in the boat and sink
The key card is for later. Return to the museum, where you have a package waiting for you.
on the door inside the hideout
The key card is used later in the game in the Black Widow's lair. Save the key card and return to the museum.
The key card is dropped at the end of the scooter chase. It is used much later in the game.
The Black Widow key card is dropped by the art thief (shady guy) when he makes his escape by boat.
its on the edge of the dock
When the strange man jumps in the boat he will drop it
if you want keycard then go to poptropicahelp.net and do island guide
When he leaves he will leave it on the docks
a girl named paisley