Right now, the rocket system is awesome and has a cool view of earth and such, and I don't know what further tier rockets will be. However in my imagining, I thought up a new rocket system (potentially)
It would be a multiblock structure you build, you must have rocket pads of course and still power, but after the required blocks, you can build a rocket-like rocket that you can walk around in, and sail to different planets in a longer than normal time. So you would go in your rocket, sit down for launch, and then launch, and once you're in space you can derp around your rocket, and landing on the moon would be through a lander like normal.
It would be a multiblock structure you build, you must have rocket pads of course and still power, but after the required blocks, you can build a rocket-like rocket that you can walk around in, and sail to different planets in a longer than normal time. So you would go in your rocket, sit down for launch, and then launch, and once you're in space you can derp around your rocket, and landing on the moon would be through a lander like normal.