Three stars walkthough for pro difficulty.
*Use the available powerups effectively. I didn't want to use the quick tasking powerup twice because then it wastes some more time until the wood is adequate for the first bridge.
* Since it needs some time to fill up gold and wood resources, try using production efficiency after the first powerup use until you make the whole area accessible.
The background video for my intro is downloaded from Videezy.com under Creative Commons License.