Isla del Sol's interstate. On the island situated in the middle of Lake Titicaca in Bolivia, there are no roads or motorized vehicles. To get supplies to houses, restaurants, hotels etc..., locals must take their mules down to the boat docks everyday and load their mules up and then make the long journey up the steep hillsides. Furthermore, the island is situated at roughly 12,500 feet. If you want increased lung power, sculpted legs and to shed a few pounds, go to work with these people. The ultimate tried and true weight loss plan.