 She was also an accomplished college athlete, earning four letters.In 1953–1954, the Heinleins voyaged around the world (mostly via ocean liners and cargo liners, as Ginny detested flying), which Heinlein described in "Tramp Royale", and which also provided background material for science fiction novels set aboard spaceships on long voyages, such as "Podkayne of Mars", "Friday" and "", the latter initially being set on a cruise much as detailed in "Tramp Royale".Ginny acted as the first reader of his manuscripts.