I'd suggest marshmallow creme bc (from this site), or mix vanilla pudding and cool whip together. Both make nice fluffy, not too sweet icing that will complement the fruit filling wonderfully. HTH 
Robin
Hhmmm. That's a tough one. One would think that the cake and filling, being pretty eclectic flavor mixes on their own, would need an icing flavor that would not overpower them. One that will mimic / compliment all of those. If you were not going to go with an icing that had a hint of one of those flavors, then I would personally suggest a less sweet buttercream or a vanilla.
OR
What goes better with those berries than whipped cream?
Im thinking you need a whipped merinque frosting... I make one with a cup of marshmallow cream added, its wonderful on fruit cakes and with fruit fillings
Richs Bettercream comes to mind for a whipped cream type of icing (also doesnt have to be refrigerated), but boy do I hate decorating with that stuff.....
I think it should be soft and neutral, as you have allready two strong flavors going on
I like SaraO's idea, but go very easy on the coconut flavoring. Just make it so that there's a hint of it. If not that, then I would suggest either the whipped cream or a mild and light buttercream, but I'm still partial to the coconut flavoring.
http://forum.cakecentral.com/cake_recipe-901-Whipped-Cream-Frosting.html
simple, yet seriously amazing. it would compliment the fruit ...and even the coconut....flavors really well. it is a light, not too sweet delicate icing. it doesnt crust, but i think it would work perfectly. pipes well too.
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