Create a new game and try this on the 1st island.
Basically the objective is to cut off the trees on a whole island, and the easiest one should be the first one where your game begins.
It took me 19 in game days, and I was constantly expanding to left & right until no tree was up on the land.
Try to have a bunch of hammer guys (like 6) because they will have to walk a ton from left to right, and also a good number or archers to support the greed to not entering your kingdom.
Of course, you can drop coins to avoid them attacking you, since the barriers on the first land are pretty basic.