A fairway that is nothing else but fairway, should have feature type set to "Fairway". But if there is anything wholly contained inside (green, tee, bunker, etc), then it should be a multipolygon. 

If you are creating it from scratch, you would draw the fairway, label it as fairway, draw the bunker/green/whatever, and label it as normal. But then you'd select both (or all) of those objects and merge or combine them (I can't remember what iD, the default editor, calls it). That will do the right thing with creating the multipolygon and merge the tags as appropriate.

But if you are editing existing objects, just make sure and look to see if the fairway is already part of a relation. If you see it as a Line, there's a good chance it is part of a relation and correctly tagged. 

I've been doing the entire country over the last three years and I'm nearly done correcting that particular problem. If you see something and are confused, please feel free to reach out. Include URLs of the object in question and I'll look.

thanks!
