Alajuela

The province's north-west holds the destination most first trips are built around: a near-perfect volcanic cone rising above a small town that has reorganised itself entirely around visitors, with a large lake behind it and a dense cluster of things to do in a compact area. The volcano's period of visible eruption ended some years ago and the mountain is now quiet, which surprises people expecting fireworks — what remains is the shape, the forest on its flanks, and the geothermal heat underneath. That heat is the real attraction. Rivers of naturally hot water surface at the base of the mountain and have been developed into everything from elaborate landscaped resorts with a dozen graded pools to a free public stretch of hot river under a road bridge where locals go with a cold drink. Around them sit hanging-bridge trails through the canopy, a tall waterfall reached by a long staircase into a gorge, caves, rafting on the rivers below, and horse riding on the lower slopes. It is the most commercial part of Costa Rica and it is genuinely worth it — the concentration means a family can fill four days without a long drive, which is rare here. The lake behind the volcano is the country's largest and a serious wind-sports destination in the windy months, with a shoreline of small villages that feel a long way from the town's activity economy.

The western shoulder of the central valley is coffee country, and the landscape reads as one: neat rows on steep ground, shade trees, drying patios and small mills tucked into the folds. Several towns here are worth a stop in their own right. One built its reputation on painting ox carts — once the working transport of the coffee harvest, now an intricate folk-art tradition that survives in workshops you can walk into and watch. Another is known for a churchyard where cypress has been clipped over decades into arches, animals and abstract shapes, which is far stranger and better in person than a photograph suggests. Higher up, the province's other volcano offers something unusual: a crater you can reach without a serious hike, looking down into a steaming acid lake from a viewing area a short walk from the car park. Access depends on gas readings and the park manages entry accordingly, so it is a place to confirm before committing a morning rather than to assume. The one practical thing to know across this whole belt is elevation: the difference between the hot lowlands and these slopes is real, evenings here are genuinely cool, and a trip that packs only for the beach will be uncomfortable. On the coffee itself — how to drink it here, and why a farm tour is more interesting than it sounds — the food guide has it.

Cross the mountains northward and the province flattens into a wide, hot agricultural plain running towards the Nicaraguan border: pineapple and sugar in large blocks, cattle, small working towns and very little tourism. The reason to come is water. A wildlife refuge in the far north protects a system of seasonal lagoons, marshes and river channels that fills in the wet season and concentrates in the dry, and the birdlife is exceptional — herons, storks, spoonbills, cormorants and a long list of migrants, alongside caimans, howler monkeys and turtles, all seen from a slow boat. It is one of the best waterbird sites in the region and it receives a small fraction of the visitors that the volcano country an hour away receives, which is the whole appeal. The rivers here also form the route north towards the border, and the towns along them run at an unhurried agricultural pace with no visitor economy to speak of. On the province's north-western boundary, straddling the provincial line and reached from a village on this side, is a national park built around a river that turns an implausible opaque blue where two streams meet and their minerals react — a demanding muddy hike to a waterfall that genuinely looks retouched, and one of the country's most photographed places for good reason.

The country's main international airport is in this province, a short distance from the provincial capital and about twenty minutes from the edge of the metropolitan area — which is the fact that makes Alajuela everyone's first province and almost nobody's destination. Two practical arguments for slowing down. The first is jet lag and daylight: a long transfer at the end of a flight day is the least pleasant driving anyone does here, and the mountain roads are exactly where you least want to be tired after dark, so a first night near the airport and a fresh start is a better plan than most people's. The second is that the provincial capital is a genuinely pleasant, unpretentious second city with a mango-shaded central park, a working market and no tourist infrastructure at all — a much easier introduction to ordinary Costa Rican life than the capital, and twenty minutes from the terminal. From here the coffee towns are an easy morning and the volcano country is a half day, which the transport guide puts in the context of journey times that are always longer than the map implies. If you are building the standard first itinerary, this province is one of its two anchors, and the trip-planning guide makes the case for treating it as a base rather than a corridor.