Stephanie Keith for The New York Times Muslim Youth Day participants hit the rides at Six Flags Great Adventure, in Jackson, N.J., after midday prayer Friday. JACKSON, N.J., Sept. 17 - It may have been Aqsa Khan's first visit to Six Flags Great Adventure, but she knew enough to hustle over to the park's largest roller coaster as soon as the midday prayer ended. "I thought I was going to die," said Ms. Khan, a sophomore at New York University, upon exiting the Nitro, the mile-long roller coaster that drops 230 feet at about 85 miles per hour. Accompanied by...