Why did the golfer change his socks?

Because he got a hole in one. That joke's about how good this golf course is. You'll hate yourself for liking it and there are many reasons why you shouldn't - 9-hole, pricey rounds, very short - but it has its plus points. Firstly, it's in town and a lot easier to get to and from for it; secondly, it's just nine holes so you can go on a weekend afternoon; thirdly, they often offer discounts. Oh, they also don't seem to mind players without formal attire who are smoking and drinking - perfectly embodying the spirit of Caddyshack.