Is there a category that covers golf courses?
There is no specific category for golf courses. Look at the area from the bird’s point of view. They don’t much care who built it, what it’s being used for, and so on. To most birds I suspect that a golf course looks like E1, ‘improved’ (i.e. heavily fertilised, lush growth) grassland. Similarly the ponds, copses and other features within a golf course should be coded as G1, B1 or whatever is appropriate. If there’s a lot of records or some significant ones (maybe birds that are only found there and nowhere else) it is very helpful if the recorder can put a note in the comments.