Plum Creek is the best play run for Louisville area boaters. 5 miles with over 50 playspots. Point your bow up stream and catch a wave, if you miss one another will quickly follow. Flowing along the Bullitt and Spencer county line the creek runs only a few days a year. Look for thunderstorms bringing 1.5"+ of rain to the area. Before the rain stops head to the river as the water will not last long.
As far as hazards, it's a narrow stream that is pretty much a flush from top to bottom, with very few eddies, strainers are a possibility. There are 3 bridges on the run and each of these should be approached with caution since the pilings can trap logs pretty easily. Class II-III skills are adequate if you are comfortable reading water on the fly.