If you head inland to Kells in Co. Meath, you could play Headfort GC. There are two courses there, each excellent. It's northwest of Dublin and not much of a detour. The new course there is superb, in my opinion - better than the K Club, Mt Juliet, and all the other parkland courses in Ireland, bar maybe Druid's Glenn. It's also only 50 euro to play - unbeatable value.