Create four picture trails for each zone. Each picture trail is a series of clues, letters, numbers, objects, pictures, pieces of a puzzle, etc. scattered around the zone. There is a map for each picture trail.
Four teams of two.
Each team has a map. Each team must follow their map to find the clues, letters, numbers, objects, pictures, etc. and then undertake the relevant tasks as shown on their maps.
Each team tries to complete each map in the shortest time.