When I'm online, anyone who brings me 100 wood will receive a Cake Note Paper, which can be redeemed for 100 wood at any later time. I'll also have prices for other objects at the Rusty Spigot written in their Cake values. You'll be able to trade with each other as well and you can check the validity of a Cake Paper by reading it's ownership. They'll be 100% mine since I'll be making them entirely on my own, and they all have the same redemption value. So yeah, it doesn't matter what the note actually says on it; as long as it is a piece of paper made by me, you can bring it to me to redeem 100 wood or trade it for something else. The reason it is paper instead of notes, is so you can stack it and not use up all your inventory space.

Steps:
1.) Make a map.
2.) Right click and then scroll to zoom out.
3.) Drag right click to move the map focus onto the top left corner.
4.) You should see a long mountain range with a bay to the east, protected by an island.
5.) Friendship Isle (or me at least) is located on the south shore of that bay, on the isthmus separated from the mainland by a river.
6.) Come visit or even build a house, I'm always giving out tools and food if I have them. Sometimes weapons.

Here's a link to a screenshot of the map, with Friendship Isle Marked:
Friendship Isle