Hire a car – go to ballinstoe, hire bikes and enjoy the trails biking.ie .
There isn’t a great deal to do in Dublin apart from drink – zoo isn’t bad, science museum is fairly small (not too bad for young lads though), Bray is a tiny Blackpool wannabe although the sealife centre is pretty good (if small).
All Ireland quarter finals are on for the GAA football, it’s less impressive than the hurling but still a good day out, should be cracking matches too – crowds are mixed so the atmosphere is awesome.
The kids would probably love the splash tour thing – you piss about dublins sights on a ww2 amphibious vehicle and pop into the water down by the docks.