Doug -
Don't know if you want to consider an inland course, but Headfort apparently has weekend times. I know Jack Marr has written about it here (positively, though perhaps not effusively). Still, Headfort has 36 holes, so securing a weekend game shouldn't be a problem. I think the Old course is the pick, but will defer to others who've been there. Google Earth has it at 50 minutes (due west) from Co. Louth.