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Dong Van is the Ha Giang region's most popular overnight stop and, not coincidentally, is home to some solid accommodation and food. But the real reason to come is for the Sunday market, one of the region's biggest and most colourful. The town is also a good base for day treks around nearby minority villages and nearby sights such as the Lung Cu flag tower and the Lung Cam Cultural Tourist Village.

A large, prosperous coastal city, Quy Nhon (pronounced ‘hwee ngon’) boasts a terrific beach-blessed shoreline and grand boulevards. Its seaside appeal and tidy, litter-free streets make it the kind of place that affluent Vietnamese couples choose to retire to, spending their final days ocean-gazing and promenade-walking.

Towering limestone pillars and tiny islets topped by forest rise from the emerald waters of the Gulf of Tonkin. Designated a World Heritage Site in 1994, Halong Bay's scatter of islands, dotted with wind- and wave-eroded grottoes, is a vision of ethereal beauty and, unsurprisingly, northern Vietnam's number one-tourism hub.

The spectacular karst limestone landscapes around Ninh Binh and Tam Coc are ideal for exploring by boat or bicycle, and there are stellar opportunities for caving and trekking amid the fast-developing travellers' scene of the Phong Nha-Ke Bang National Park. Dong Hoi, the coastal gateway to Phong Nha, also has an enjoyable low-key beach scene and good restaurants.

Quang Ngai city is something of an overgrown village, so most visitors only drop by for a spot of grazing at lunchtime. The few travelers who venture here for longer usually do so to pay their respects to the victims of the most famous atrocity of the American War at nearby Son My.

Cat Tien comprises an amazingly biodiverse area of lowland tropical rainforest. The 72,000-hectare park is one of the outstanding natural treasures in Vietnam, a true jungle, and the hiking, mountain biking and birdwatching here are the best in the south of the country. At weekends and public holidays it gets busy with domestic tourists – it's worth calling ahead to book the most popular excursions.

The high-rise, high-energy beach resort of Nha Trang enjoys a stunning setting: it's ringed by a necklace of hills, with a turquoise bay dotted with tropical islands.

The bustling port city of Phan Thiet is traditionally known for its nuoc mam (fish sauce), producing millions of liters of the stuff per annum. There's not much to see in town, but the riverside fishing harbor is always chock-a-block with brightly-painted boats and there are sights nearby including the Ke Ga lighthouse and Ta Cu Mountain.

Pronounced ‘hway’, this deeply evocative capital of the Nguyen emperors still resonates with the glories of imperial Vietnam, even though many of its finest buildings were destroyed during the American War.

This really is a tale of two cities: Phan Rang hugging the shoulders of Hwy 1 and Thap Cham straddling Hwy 20 as it starts its long climb to Dalat. Anyone travelling Vietnam from north to south will notice a big change in the vegetation when approaching the joint capitals of Ninh Thuan province. The familiar lush green rice paddies are replaced with sandy soil supporting only scrubby plants. Local flora includes poinciana trees and prickly-pear cacti with vicious needles.