If your looking for public hunting areas try state parks and state game lands. PA has a lot of public land so finding a place to small game hunt should be easy.
there arent too many oddball hunting laws here in PA, like you said you cant use semi-autos or hunt on sundays. you can hunt crows on sundays. during the bear season and the muzzleloader deer seasons you can only use .22 rimfire guns to hunt small game.
http://www.pgc.state.pa.us/pgc/cwp/browse.asp?a=480&bc=0&c=69913&pgcNav=|
http://www.dcnr.state.pa.us/