290 kilometers (180 miles)
This one-day ride from Melbourne to Petersbrough winds through shoreline rainforest, skirts sensational surfing beaches and unfurls along the rugged Shipwreck Coast, renowned for limestone pinnacles piercing the sea like witch's fingers.
More on CNN: World's 10 ultimate drives
It's a perfect northern winter ride.
Big Boyz Toyz, +61 (0)8 9244 4293
4. California and the American West
5,630 kilometers (3,500 miles), Los Angeles to San Francisco (the long way)
This undisputed champion of road trips weaves together many of the West's iconic national parks.
From Los Angeles, Route 66 traces back in time to Arizona, the Grand Canyon and mesmerizing formations of Monument Valley.
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Heading north, the road takes in Natural Bridges National Park, then arcing west takes in Bryce and Zion national parks.
You can twist the throttle across the Mojave Desert to Death Valley then skirt the snow-capped Sierra Nevada northbound to Lee Vining and Yosemite National Park -- unrivaled in grandeur.
EagleRider Motorcycle Rental & Tours, +1 310 536 6777
5. Cape Town Circuit, South Africa
1,690 kilometers (1,050 miles)
Fantastic roads, amazing scenery and excellent climate -- South Africa is perfect for a one- or two-week fly-ride vacation.
From Cape Town the wild coast heads east then the road turns north over the Olifantskip Pass to Addo National Park -- a good chance to shoot big game with your camera.
A throttle-open ride across the Great Karoo to Oudtshoorn heralds dizzying switchbacks -- via Route 62 -- over the Little Karoo Mountains to sample the wines around Robertson before closing your loop in Cape Town.
Motorcycle Tours South Africa, +27 12 804 3805
6. Pacific Coast Highway, California
320 kilometers (200 miles), San Luis Obispo to San Francisco
No top 10 would be complete without this stellar ride.
Civilization disappears quickly as you dance a thrilling two-lane tango past seal-strewn beaches, redwood forests, plunging cliffs and the crashing surf of Big Sur.
Also en route -- the fishing town of Monterey, the surfing capital of Santa Cruz, and everyone's favorite city with a famous bridge, San Francisco.
EagleRider Motorcycle Rental & Tours, +1 415 647 9898