I'm from London and I went to six flags new jersey in 2018. My first coaster (as an adult being able to ride an actual rollercoaster and not just a gentle ride) was Kingda Ka, an absolutely incredible launch coaster. It was also the first ride I went on at the park. I couldn't keep my eyes open on my first go on Kingda Ka, so I made sure to go again and focus on not clamping my eyes shut haha. Nitro and El Toro were my joint fave rides at that park but pretty much everything blew me away because It was my first real trip to a theme park. I'd been to Alton Towers as a kid but was too short to go on anything, and Efteling in 2011 but I only went on one ride. Need to plan some Europe trips!