Without proper planning, this scenario can be incredibly difficult to complete. It is known to be one of the more "flawed" scenarios in the expansion packs that are nearly impossible to complete. The issue is that new guests entering the park are initially sleepy or not very happy. Each new guest will drive down the park rating. It is important to place an entertainer in the front of the park and have it patrol only the first couple of 4x4 blocks selectable.