Usually opening day is empty, but this year it falls right at the start of New Jersey's spring break on Good Friday so it will probably be quite crowded. I would advise getting there by 9 or 9:30 to buy tickets or season passes. Then I would go for Nitro first, but if you have been waiting all winter for the lap bars on Chiller, then be my guest and knock yourself out. Then just hit the general rotation of Movie Town coasters and then Frontier Adventure coasters. Viper will open with the park this year so you definetly want to check that out.
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