Lake Atitlan Hiking. Lake Atitlan is a large lake located in the Western Highlands of Guatemala, known for its stunning beauty and clear waters. It is surrounded by volcanoes and offers a variety of hiking and trekking opportunities for visitors. One of the most popular hikes around Lake Atitlan is the volcano hike of Volcan San Pedro. The hike is moderate to challenging, with a steep climb to the summit of the volcano, but the views from the top are well worth the effort.