The upper Clarence downstream of Tennyson is suppose to hold good numbers of fish.
If you do not want to fly fish or spend much then I suggest using small lures, I like spin blades. Get a selection of different colours (bright and dull). Its been a while since I looked but I suspect its possible to get decent lures for a fair price on trademe. These a lot of rubbish or there to. Shame that store brought spin-blades can now cost $10+ each. If you are prpeared to spend more then a few tiny Rapala (or similar quality minnow lure) are worth having. The Storm branded ones are good and about half the price.