That coffee shop is the Trading Post I think, it's still there, or at least a cafe is. Good cake.
Haven't been down Swansea/gower for 3 or 4 years now. Must make a effort this summer! Not beer related either, but joes ice cream in mumbles is also awesome!
And I do have all my own crazy golf kit!
if in mumbles try the pilot - home of the pilot brewery. They also supply to other pubs in the area and you might be able to pick up some tips from the owner.
http://www.thepilotofmumbles.co.uk/
there's also a video of the brewing on the site.