Hmmmmmm... honeymoon...
Well if the weather has been ok and it's not too swampy I think the romance of Uragh is hard to beat.
If, as a newly married couple, you want tips on garden landscaping, I recommend beaghmore.
If you have a tiff and want to silently call your new wife names, go to Labbacallee (just don't tell her what the name means)
and if the weather is grotty go to the Gap of Dunloe in Killarney. Like something from a fairytale, it's not a monument, but like the Lake District it's a landscape that just seems to get more beautiful as the weather gets worse.