I have never made coconut cake before this weekend. 
It is fairly simple. 
I used this recipe except instead of making it into a tiered cake, I just made a huge single layer cake.
Cake mix...

This icing is awesome, just sayin.

After adding the roasted coconut to the icing mixture.

The nice thing about this cake is that there is just a hint of the coconut flavor in it. 
I've tried others that have been a bit overwhelming! 
I used unsweetened coconut shavings and I think that made it perfect.