There is some great water up by the Chimneys picnic area and upstream as well. Myself, this early in the season I would focus on the WPLP from just upstream of Gatlinburg to the Quiet Walkways below the picnic area. I just think (I could be wrong) that the water temps will be too cold up by the picnic area this early in the season. The stream gains a great deal of elevation between the picnic area and south Gatlinburg and that will make the water at least a few degrees cooler in higher reaches of the stream. I would try down lower and if have some success you can always move upstream to try some different water. I highly recommend that you buy a temperature guage to check the water temps and see what works and doesn't work.