Isla del sol island of the sun is an island in the southern part of lake titicaca it is part of the modern state of bolivia and is part of the la paz department geographically the terrain is harsh it is a rocky hilly island with many eucalyptus trees there are no motor vehicles or paved roads on the island the main economic activity of the approximately 800 families on the island is farming with fishing and tourism augmenting the subsistence economy of the several villages yumani and