The hills and the dam. The former are easy enough - just look around you. The latter takes a little more effort, but isn't difficult. You can't just turn up - Cahorra Bassa is a secure site and you'll get turned away at the gate even if you do walk the distance between Songo and the dam. Fortunately the owner of the O Sitio restaurant in Songo is head of the public relations so head there and ask him about visiting.
