Up early today and out on the hike to Lago Los Tres. We both agreed this is the best day hike we've ever done, world class hiking. It was beautiful and clear when we set out and the hike was just perfect - well marked so no anxiety about route finding, plenty of it was level and open and the views were phenomenal. There was a very steep climb at the end up to a viewpoint where you are at the base of a glaciar and amazing aqua marine lake with the mount fitz roy peak towering straight above you. we continued on down and round for an additional vantage point on the lake and glacier. It sounded like thunder but was the glacier groaning and rumbling in a kind of rock amphitheatre. Needless to say we took about a zillion photos. Lots of other hikers here from all over the world but a great atmosphere. We think it was about 15km in all, about 50% ascent to 750m at the highpoint. Both shattered but in the best way.