Visited Natural Bridge with a mate a few weeks ago.
There are two paths to the cave, both are easy and short walks.
The waterfall is very impressive and I wished we had of gone at dusk to see the glow worms which I am told are impressive.
One thing to note is that the address listed on trip advisor of 87 Carricks Rd is NOT where natural bridge is... we went there... we should know! (I think its a parks office or something)
There is a turn off to natural bridge about 10 mins away from this address... When you get to the natural arch cafe you're almost there... (They also serve a nice burger!)