The King's River is a bouncy, fun run with a few holes to avoid. Not as good as, but a refreshing change from, say, the Upper Liffey.
The Annalecky Brook is an optional add-on at the start. It's narrow, shallow, twisted, and nasty. On the up side, it's quite short and easily skipped.
The Annalecky Brook opener is only runnable with lots of rain (it's visually obvious if it up). It's a classic Wicklow ditch with encroaching trees and narrow lines. It's also very short - a couple of hundred metres. If there's not enough water, or if you don't like the ditch, you can skip it by walking down to the confluence with the King's River proper. This is a wider river with several holes to catch the unwary and you'll need to keep an eye out for encroaching trees. It picks up in intensity as you go along, with the 'surprise' hole right at the take out.
Upstream of the confluence on the King's it looks like there might be further fun, but I don't know if anyone has run that section or where you might get in - probably a forest hike from the road.Interactive map loading...