Swatara Creek is right there in Hershey, and at a prime level for Summer wading/fishing. It's a WW creek...expect Smallmouth and Fallfish mostly.
Quittapahilla in Annville is a limestoner and stays cold, but is generally tough fishing for whatever stockers held over. It has limited, if any, natural reproduction. I'd either be there at first light, or late in the evening to see if you can pick off a riser or two, otherwise it's tough going in the Summer.
The freestoners north of town (Clarks/Stony/Manada/etc) are all very low and probably tough right now too.
I'd just fish the Swattie for Bass if it were me.