Hallo Gapie
You are on your way to probably the best small mouth venue in this country! I have fished the Breede in Robertson/Bonnievale area a lot, hope you have a canoe?
If you are hunting smallies, I suggest you look before and after the rapids that is ussually where they are most active. Very effective lures would be "Ring Worm" colors black/Chartruese or green pumpkin on a small texas weight. "Fat Albert Grub" on a little 1/8 ounce jighead. You have to fish the rocky area's before and after rapids that is where they hunt. If you want to use hard baits I suggest rapala jerk baits green and gold!
If you are chasing large mouth stick to the side of the river and you have to fish in the structure, trees, reeds, grass, rocks all there. Use a normal texas rig with a dark color worm. You will occasionally hook a smallie in the structure as well.
I don't know how hard the river is flowing at the moment, I know the cape had a lot of rain. If it is flowing to hard stick to the side you will still pick up some fish.
Good luck and let me know!