- collectibles on an island should be clickable/collectable by others. The owner would get the collectibles in a message, and the ones who found them would get a share.
- a lot of the collectibles are hidden behind objects. To make finding them easier, they could have a bold outline or an animation (shuddering trees or shrubs, a burst of wind, some sound) if the mouse cursor gets near.
- it would help if the icon of the collectible weren't blue, like buildings', but a different colour.
- there could be tips to help the search, like listing what kind of collectibles can be found in each zone, or reveal a part of the picture near the collectible to help searching (or make it harder if the image isn't recognisable).
- the first tip would be free, the second would have a time-limit or it would cost some raw materials.