The Forum is the narrow wall just upstream of the Arboretum, about 400 metres downstream from the Hanging Garden. Though not as sheltered as other crags, it may remain dry in a light southerly. Pitches are 25 to 30 metres long, with the wall gaining extra exposure credits from the traversing approach to the first belay station at the 30 metre level.
The first crag you reach from the Arboretum parking (gravel pullout 4.7km from SH6 with a rock cairn). Follow the vague track through long grass and "the mangroves" to the sandy (and hopefully dry) riverbed. Walk downriver until you reach a flagged trail signposted "Forum" leading off to the left after about 100m after entering the riverbed (if you arrive at the log jam you've gone too far). Take the vague trail up to the left through the bush to a fixed traverse line 1/2 way up the cliff. Traverse out to a belay station, the three climbs start from here.