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Designated a Unesco World Heritage Site in 2003, the remarkable Phong Nha-Ke Bang National Park contains the oldest karst mountains in Asia, formed approximately 400 million years ago. Riddled with hundreds of cave systems – many of extraordinary scale and length – and spectacular underground rivers, Phong Nha is a speleologists’ heaven on earth.

Tay Ninh town, the capital of Tay Ninh province, serves as the headquarters of one of Vietnam’s most intriguing indigenous religions, Cao Daism. The Cao Dai Great Temple at the sect’s Holy See is one of Asia's most unusual and astonishing structures. Built between 1933 and 1955, the temple is a rococo extravaganza blending the dissonant architectural motifs of a French church, a Chinese temple and an Islamic mosque.

Ninh Binh is a good base for exploring quintessentially Vietnamese limestone scenery. Few Western tourists head here, but many Vietnamese flock to nearby sights, including the nation’s biggest pagoda and the Unesco World Heritage–listed Trang An grottoes.

The picturesque little province of Ben Tre was always one ferry beyond the tourist traffic of My Tho and consequently developed at a more languid pace, although new bridges connecting Ben Tre with My Tho and Tra Vinh funnelled more visitors into the area. The town’s sleepy waterfront, lined with ageing villas, is easy to explore on foot, as is the rustic settlement across the bridge to the south of the centre. This is also a good place to arrange boat trips in the area, particularly for those wanting to escape the tour-bus bustle. Plus, the riverside promenade and the narrow lanes on both sides of the river are ideal for two-wheeled exploration.

Heading east of Hoi An, new housing and hotels mix with older rice paddies, and the riverbank meanders for around 5km to sandy beaches. This palm-fringed coastline extends north to Danang, and despite the development, there are still a few quieter stretches; it's a good area to explore independently on two wheels.

A popular weekend escape from HCMC, Vung Tau rocks at weekends when beach-starved locals and expats descend in numbers, but it is relatively quiet during the week. The city enjoys a spectacular location on a peninsula, with ocean on three sides; the light and sea air make it a refreshing break from sultry Saigon.

Practically obliterated during the American War, Vinh was rebuilt with East German aid – hence the brutalist concrete architecture dominating downtown. The only reasons to stop here are if you're a Ho Chi Minh devotee (he was born in a nearby village), or if you're heading to Laos.

Fringed with white-sand beaches and with large tracts still cloaked in dense tropical jungle, Phu Quoc rapidly morphed from a sleepy island backwater to a must-visit beach escape for Western expats and sun-seeking tourists. Beyond the resorts lining Long Beach, rapid development beginning on the east coast and mega resorts in sight of Sao Beach, there's still ample room for exploration and escaping the sometimes littered waters. Dive the reefs, kayak in the bays, eat up the back-road kilometres on a motorbike or just lounge on the beach, followed by a massage and a fresh seafood dinner.

Ha Giang is the final frontier in northern Vietnam, an amazing landscape of limestone pinnacles and granite outcrops. The far north of the province has some of the most spectacular scenery in the country – if not the region – and the trip between Yen Minh and Dong Van, and then across the Mai Pi Leng Pass to Meo Vac, is quite mind-blowing. Ha Giang should be one of the most popular destinations in this region, but its distance from just about everywhere else keeps visitor numbers at a low level.

Tra Vinh, one of the prettiest towns in the Mekong Delta, is a peaceful place to explore the region's little-touted Cambodian connection. Around 300,000 ethnic Khmer live in the surrounding province and the area is dotted with more than 140 Khmer pagodas. With wide boulevards shaded by lines of trees, the town itself is more symbolic of the French colonialist era, but get beyond the outskirts and you'll soon discover that Khmer culture is still alive and well in these parts of Vietnam. Tra Vinh also has a small but active Chinese community, one of the few such communities that remain in the Mekong Delta region.