I've planted four large trees with small treehouses inside them. The houses have spawn points inside them. There is also a small cave with a spawn point in it.
Here are two screenshots (sorry no shaders):


That's not the only thing I have to add today. I've placed music bricks around the forest so that you can hear the ambient birdsong.
I also finally have proper boundaries instead of sick transparent walls, and I have rocks.
Here's another screenshot:

Currently in queue:
- Falling leaves for the large trees
- Meeting zone, with coffins, graves, and a tree in the middle.
- A new model of medium-sized tree, with its own falling leaves.
- Smaller details: Bushes, flowers, weeds, maybe termite nests.
- Ground filled with fallen leaves.