And the volunteer guides are gossipy and cheerful.

Since then, they have expanded into a non-profit-making venture with a dozen volunteer guides.

Several trolley-cars are also rented for the duration of event, on which volunteer guides direct people to workspaces and local landmarks.

Volunteer guides conduct tours for visitors, while volunteer docents augment the educational program.

The tours stopped at viewpoints where the volunteer guides urged passengers to imagine how the valley would look when flooded by the dams.