Here is a rundown of the buildings that are unlocked, what they can do and how long it takes.
Piñata Party
Makes 5 party points in 1 minute
Makes coconuts in 1 minute
Mini game where you can unlock coins and other items, you can repeat the game after one minute.
Makes gas clouds in 2 minutes
Makes bamboo in 3 minutes
Hammock
Makes 20 party points in 5 minutes
Makes Razor Clams in 5 minutes
Rec Center
Crafts numerous items to entertain the Minions
Skateboard - 2 cococnuts and 1 bamboo - 5 minutes
Weapons Armory
Crafts weapons
Grenade - 3 coconuts and 1 gas cloud - 3 minutes
Trowing Star - 2 razor clams - 15 minutes
Storage Building
Used to store all your items.
It can be expanded.
At level five you can use it as a market place to buy and sell items.