I concur with the comments about choosing routes based on traffic safety and road design, including speed limits, bike lanes, and intersection hazards, such as right side merges and free right turns (in countries in which we drive on the right -- Machcka and Rowan need to reverse this for Tasmania
).
Hills are not a particular concern for me, because I lived in west Los Angeles when I took up serious cycling as a UCLA student, and most of my favorite rides were in the hills of Bel Air, Brentwood, Pacific Palisades, and Malibu.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069