If you are in PA near Hershey drive to Knoebels. I can't say anything bad about this park. Go over to URC and read all the positive TR's about it. It's only about 3 1/2 hours from NYC. Do a two or three day trip hitting Knoebels, Hershey and Dorney all three are within an hour and a half of each other.
As for Six Flags find out which has the cheapest season passes. I live in PA and bought Kentucky Kingdom passes this year for $45. I think Great Adventure wanted around $100 for them. Sure We had a long drive but we hit Holiday World and PKI too. On the way home we hit SFA for $8 parking. So far with our SFKK passes we hit SFKK, SFA(2),
SFGAdv, SFNE, SFO, and Wyandot Lake for Free just parking. Then we showed our passes at Great Escape and got in for half price. I'd say we got our $45 worth. I think SFA are cheaper than SFGAdv too. Shop around.
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Parks Hit For 2000! PKD, BGW,DP,HP,PKI,HW,SFKK,SFA,GAdv,SFNE,LC,GE,QP,CDP,LP,KG,SFO,WG,GE,KW,IW,WL,