More than a month after Niagara Amusement Park & Splash World announced it would not open for the 2026 summer season, some season pass holders say they are still waiting to receive promised refunds.Back on April 30, IB Parks & Entertainment, the company operating the Grand Island park formerly known as Fantasy Island, announced Niagara Amusement Park & Splash World would not open for the 2026 season. In a public statement, the company said all 2…