Thanks Richard, Lee and Eddie.
Yep there's a visitor centre with easy parking and various different waymarked routes. It's definitely well worth a visit - Corra Linn (#1) in particular is genuinely impressive. There are unofficial scramble routes down from the paths to get closer to some of the falls; I tried one of them even though I had my two my two Beagles tied to me (lower ledge on the right of #3). Definitely not one of my better ideas - it couldn't have been more slippy if it had been carved from ice and copiously sprayed with silicone lubricant