One answer would be neighborhood
the tree house is in the forest at the medieval party :)
In the tree house. Go to the forest the and up the tree.
Leaf
click on the huge open tree
go to the friendship forest entrance and click on the hole at the base of the tree
There is a dent in the tree in the top corner. Click inside it.
Normally you use your house or the trees in the rain forest. Nearly everyones house is somewhat close to a rain forest of a big tree so, they use that as their shelter.
One could get a tree home built from the company Blue Forest. Blue Forest builds luxury tree houses and can make anything from fantasy play areas to romantic tree house hideaways.
Tree+tree=forest
Go to the Enterance place by Friendship Forest and if you can see the tree w/ the big hole @ the bottom click there.
tree+tree=forest
A tree is one tree and a forest is many trees.