This was done due to the character limit in the mainland village. With the island working as a second village it is possible to have a new character limit on the island so that people can still add new Smurfs there even when they reached the maximum on the mainland but it still allows the game to be played on older devices with limited memory as well.
This also means, that some of the features (for example the ability to colour items with Painter Smurf or Farmer Smurf’s Plant All and Harvest All Modes) and most of the special Smurfs (like Farmer Smurf, Smurfette, Miner Smurf etc.) are not available on the island (at least not yet).
The only Smurfs that can go from the mainland to the island are Brainy Smurf, Papa Smurf and Dreamy Smurf. Papa Smurf will give different quest lines on the island and on the mainland.
To go to the island just tap on Dreamy Smurf’s ship that is docked at the beach and it will take you there.
The island has the same basic building and shop principle as the mainland (four different shops with different kind of items etc.) but there are items that will only be available on the island and not the mainland and vice versa.
The island itself can be expanded to the south for 25 Smurfberries, just like the mainland, though this expansion is at the moment only available once on the Island .
The Raft House (by Brainy)
On the island, one of papa quests is to place a raft house. The only place you can place a raft house is along the water line near the boat. Just look for the ghostly image of the raft house along the water line when you are looking for a spot to place the raft. Currently, the maximum number of rafts you can have on the island is 5 .
Gifts from raft expeditions are : yellow crab, hammock, green chair, blue changing room, straw umbrella, smurfberries, coins, beach tower, potions, rare pavilion. (credit to Jewel Morel)
Gift chances from raft expedition: 1 hour with 10% change, 3 hour with 20% changes , 24 hour with 30% chances (credit to Jewel Morel)
There are some issues/bugs with the rafts:
1. Some people have reported the raft doesn’t do anything when they tap on it .
2. Others (including myself) have seen where rafts are sent out for expedition but haven’t returned after 24 hour.