Tip for more stars and moons:

Click on Build on the right side of the screen
then click on the moon tower or star towers
place them on the ground of the island (to build it)

Use 1 star or moon dust (doesnt matter which) and then click on demolish and use 1 star or moon

If you used a moon to begin with you may need a moon to demo it .

Once the buildings foundation of gone you wait a few seconds and then a hail storm or stars or moons (depending on the building you chose) will come ...

the only bad thing about it is you have to go through the whole island picking up stars or moons ... and you are timed because they will dissapear so make sure you have a tribe member with you so they can pick them up ...

This technique also works with the boat house ... click it give it star power click demolish and then check your Build button again and a boat will be there ...