Alajuela is where most Costa Rican family adventures begin, the lush Central Valley region that holds the country's main airport, then quietly turns out to be one of its best destinations in its own right. The headline is Arenal, the near-perfect cone of a volcano rising above the town of La Fortuna, ringed by rainforest, waterfalls, and natural hot springs. Families cross hanging bridges through the canopy spotting toucans and sloths by day, then soak in volcano-warmed thermal pools by night, which is about the most magical way imaginable to end a day with kids.

The volcanoes keep coming. At Poás Volcano National Park, a short, easy walk brings families right to the rim of an active, steaming crater, safe and manageable even for small children, and the nearby La Paz Waterfall Gardens pairs thundering falls with a sanctuary of rescued jaguars, monkeys, and butterflies. Coffee plantations across the valley run interactive bean-to-cup tours that kids enjoy as much as the grown-ups, and the city of Alajuela itself offers a slower, authentic pace of markets and cafés. The accommodation leans toward rainforest eco-lodges and hot-spring resorts with family rooms, pools, and guided tours, much of it tied to Costa Rica's strong sustainable-tourism ethos. Alajuela is the volcano-and-rainforest heart of a Costa Rica trip, the perfect adventurous first chapter before the family heads for the coast.