You could add a BASA Island in the part of the ocean where there is no island yet and use it as a landmark. And you could prepare rockets and train to be an astronaut. There could also be a control room to launch these rockets into space with players on board. And then there could just be space and they could live on the rocket ship and fix it. Kind of like the plane. and they could end up in a capsule in the ocean when they want to return to earth.
I know that there is already a house. You could also launch a spaceship from there too. In like the plane, no matter how many different spaceships you sent up, it would always teleport you to the same rocketship, again like the plane.