Hanoi, Nov. 9 -- Long and sinuous, Vietnam curves around the eastern shores of mainland Southeast Asia, becoming a perfect country for road-tripping, according to renowned US travel magazine Lonely Planet. The magazine noted that its twin megacities - Hanoi and Ho Chi Minh City - are divided by 1,137km of mountains, jungles, paddy fields, beaches and historic sites. The trip between Vietnam's northern and southern cities is just one of many epic road trips that call out to adventurers on four (or, more commonly, two) wheels. With more than 61 million motorbikes on Vietnam's roads, intrepid bikers will find themselves in good company as they explore the country's wonderfully diverse landscapes, with ample repair shops, gas stations and foo...