The Golfo Dulce is a tropical fjord — deep, calm, sheltered — and one of the world's most consistent humpback whale nurseries. Activity peaks in August and September (southern population) and again in January and February (northern population), with humpbacks visible nearly year-round between the two seasons.
Half-day boat trips depart from Golfito's main dock. Several operators in town book trips with biologists who know the resident animals individually. Dolphin pods are present every month; the eastern Pacific spinner dolphin is particularly common.