I'm a new player, and I recently performed my first visits to all the planets and moons in the systems. A request was made for files, so these are the vehicles I've used successfully in the endeavor. The first manned interplanetary missions were accomplished by the Prometheus which took a marathon journey scanning every target destination, landing everywhere possible with the exception of Duna, Eve, Tylo, and Laythe. The next iteration on the design is the more powerful ship, the Daedalus, which began its journey with a landing on Duna, progressing afterwards to Tylo where it waits in orbit for future tasking.