At 4,604 metres above sea level, Laguna 69 is one of the most visited day-hike destinations in the Cordillera Blanca, and deservedly so — the colour of the water against the surrounding glaciated peaks is extraordinary. The hike from the trailhead at Cebollapampa (reached from Huaraz via the Llanganuco valley) takes 4–5 hours return and involves 700 metres of ascent. It is well-marked and does not require technical skill, but altitude is a serious factor: spend at least two days acclimatising in Huaraz before attempting it.
The trail passes through polylepis forest, past herds of llamas grazing at altitude, and through high puna grassland before reaching the lake. A second, smaller lake sits just above. The trailhead has basic facilities and the Llanganuco lakes below are turquoise and beautiful in their own right. An early start from Huaraz avoids afternoon cloud and the worst of the crowds.