Mineshaft Escape!!!

You are sailing across the ocean(this one is not cursed :P) and you find a chain link of 3 islands. You settle on the biggest one. You decide to go mining, but you get lost in a mineshaft! (Don't worry, this isn't impossible. You just need to FIND where to go, you don't need to mine, but you can).

Objectives-
Get back on the island! It has a lot of Spruce trees.
Cut down ALL the trees, and replant them.
Build a bridge, connecting all of the islands.(For Experts: Connect all three islands!)
Get the animals to have babies, using wheat.
Make a wheat farm
Craft full diamond armor and a diamond sword
Craft an enchantment table

Additional Notes

How to put on macintosh/apple computers-
Open Finder
Go to your user name, it should have a house next to it. double click it.
First copy the map in downloads.
Then go to your username again and open libraries
Open Application Support
Select minecraft
Open the folder there named Saves.
Paste the folder of the map

For windows(this is way easier lol)
Copy the map name in downloads
type in username appdata roaming .minecraft
then find the Saves folder
paste it.