When to fish is probably more important than where to fish in many cases. Based on angler use counts that I have done for years on opening day, anglers really thin out between 10AM and 11AM. Also, since the new regional opener went into effect, water temps have been much lower in SE Pa at 8AM on the opener than previously experienced. I have seen some evidence and heard from very reliable sources that afternoon fishing has been much better than in the past. But, if you're looking for less crowding at 8AM, the DH areas would be a good bet I have been told. If you're determined to be on the water at 8AM and on a regular stocked trout stream, then I would recommend the more rural, at least in appearance, SE Pa streams, especially the smaller ones. Some Lancaster Co streams, and those in NE Berks, NW Lehigh, and Schuylkill Co might be good bets.