IF you want to go to you're island But you don't have any of these or don't even have one of them.

Game Boy Advance
Connecter Cable
Animal Crossing for the Game Boy.

But you do have an AR All you have to do is go to the area where you connect and let Cap'n come by, and then use the Z is jump code to jump into the lake and keep walking down untel you get to you're island.