Roseau, Dominica: the Nature Island's capital, its rivers and the Boiling Lake

Set expectations correctly and this becomes one of the most rewarding islands in the region; set them wrong and it will disappoint. Dominica is geologically young and still active, which means mountains rather than plains — the interior rises to well over a thousand metres, several peaks are volcanic, and the terrain is so steep that roads switchback constantly and journeys take twice as long as the map suggests. The rainfall that comes with that produces genuine rainforest and an extraordinary density of rivers; the island's own claim of a river for every day of the year is the sort of figure nobody has audited, but the impression on the ground supports it. The beaches, where they exist, are pockets of dark volcanic sand, and the few pale ones are on the rough northeast coast. There are no large all-inclusive resorts and the accommodation is overwhelmingly small — guesthouses, eco-lodges, family-run places. What you get in exchange is an island with almost no crowding, where the attractions are physical rather than curated, and where the diving and hiking are both genuinely first-rank rather than merely pleasant.

The capital is small, tightly packed and more atmospheric than its size suggests. The street plan is a compact grid between the bayfront and the slope, and the surviving older buildings are timber with stone lower floors, fretwork balconies and overhangs that shade the pavement — a domestic architecture built for heat and rain, and best seen in the streets immediately around the cathedral. The Old Market square, paved and shaded, now holds craft and produce stalls and is the natural centre of town. The Saturday morning market by the river mouth is the real event, though: it is where the whole island's produce arrives, and it is large, loud and worth arriving early for. On the town's eastern edge, the Botanical Gardens occupy a generous open expanse at the foot of the hill — a place residents use daily, with big specimen trees, a parrot aviary for the endemic species, and, as its improbable landmark, a school bus still pinned beneath the trunk of a baobab that fell on it in a hurricane decades ago and was left exactly where it lay. Above the gardens, the short climb to Morne Bruce gives the whole town, the harbour and the coast in one view.

The island's headline walk is the Boiling Lake, in Morne Trois Pitons National Park — a flooded fumarole, the second-largest hot lake in the world, its grey water genuinely churning at the centre. Reaching it is a serious day: six to eight hours return over sharp ridges and through the Valley of Desolation, a bare, steaming, sulphur-stained basin that looks like nowhere else in the Caribbean, with hot streams to ford and mud throughout. Take a guide, start at first light, and treat it as a mountain day rather than an excursion. Everything else is easier. Trafalgar Falls sends two adjacent waterfalls down a rock face twenty minutes from town, with a hot stream mixing into the cold pool at the base. Titou Gorge is a narrow slot in the rock that you swim up, walls close on both sides, to a waterfall at the end. Emerald Pool, in the interior, is a short forest walk to a basin under a fall. And spread across the island are hot sulphur springs, some developed into soaking pools, which are the correct way to end any of the above.

The same volcanism that shapes the land continues offshore, and it produces one of the region's oddest snorkels: at Champagne Reef, just south of Roseau, geothermal vents release streams of bubbles through the seabed, so you swim through columns of warm gas rising past the coral. The diving more broadly is excellent and unusually accessible — the island's shelf is narrow, so walls and pinnacles start close to shore, and Soufrière Bay to the south is a flooded volcanic crater with dramatic drop-offs inside it. The single most remarkable thing in Dominican waters, though, is the sperm whales. Unlike almost anywhere else, they are RESIDENT here rather than migratory: family groups live off the west coast year-round, and the deep water close inshore means boats reach them quickly. The reliable season runs roughly November to March. Trips are strictly regulated and encounters are not guaranteed, but hearing them on a hydrophone is close to certain, and the odds of surfacing whales are good enough that this is the reason a great many divers and naturalists come at all.

Dominica built the Caribbean's first long-distance hiking trail, and it runs the length of the island in fourteen segments, from the far south to the northern tip, through rainforest, along ridges, past villages and over the mountain spine. Few visitors walk the whole thing; a great many walk one or two segments, and the segments differ enormously in difficulty, so choose with local advice rather than from a map. On the northeast coast, the Kalinago Territory is a self-governed area, the home of the Caribbean's last organised Indigenous community, with its own chief and council. It is a living place rather than an attraction — villages, gardens, churches, schools — and the way to visit respectfully is through the cultural village, where canoe building from a single trunk, larouma reed basketry with its distinctive patterns, and cassava bread making are demonstrated by people who make these things anyway. The basketry in particular is exceptional and is the best thing to buy on the island. The coastline along that stretch is rugged and windswept, with a rock arch at Sineku, and it is a completely different island from the sheltered west.

Access is the thing to plan first, because Dominica has no jet-capable international runway. Douglas–Charles (DOM), on the northeast coast, takes regional and short-haul aircraft, and the drive from there to Roseau is spectacular and takes about an hour and a half. Most travellers connect through a neighbouring hub, and a great many arrive instead by the inter-island ferry, which links Roseau's bayfront directly with Guadeloupe, Martinique and St Lucia in a few hours — often the simplest routing, and a good day out in itself. On the island, minibuses run set routes cheaply from Roseau but thin out in the evening; taxis use fixed rates agreed in advance, and a hire car with genuine ground clearance is worth it if you intend to reach trailheads on your own schedule, keeping in mind that driving is on the LEFT on steep, narrow, frequently wet roads. Seasonally, Dominica is among the wettest islands in the Caribbean and rain is possible any week of the year; February to June is the drier stretch and the best for hiking, the hurricane season runs June to November, and the whale season sits in the northern winter.