I believe you can keep going until you are at the low levels of the falls - but I don't know when it becomes technical and requires ropes. I think you can get about 500m from the falls before it gets really tough. But I'm going on words of other - I haven't been far past the chainladders - but I did the Gorge long before I took up proper hiking as a hobby. It was a hot summers day and I wasn't very fit.
Good old Rhino Pass. Drakensberg weather is always funny - it snowed in February a few years back, so don't count on there being no snow. Actually - more count on there being at least a bit of snow and ice around. The area gets more snow than anywhere else in the Berg and it lasts longest there. If you check the photos in my hike write up on Gypaetus Pass (
http://www.vertical-endeavour.com/forum ... tupid.html) - Giants Castle area in September last year - notice how much snow was still around even though it hadn't snowed for 2 weeks. I don't picture the pass being impassable though...