The road ended at the narrowest part of the lake, it was about 1 km across. San Paulo was on one side and San Pedro on the other. We paid to take a boat ride across, it was an old wooden boat the had rotting floor boards. The captian was a grouchy old salt that made us wait while he tried to get more customers for the already full boat, there was a lot of yelling in Spanish between the captain and the other people on the boat before he finally gave in and took us across the lake. We explored the small town then returned to the other side and drove back to La Paz.