I love Arches! This is my favorite place on Earth. We spent half a day driving through the park and taking pictures. We even hiked up to Delicate Arch. It was a hard-ish hike for someone who is not in shape and not a hiker, but do-able! It was so worth the hike! The Delicate Arch is breathtaking! I could sit there for hours just staring at it.
I found the tunnels kinda creepy and I scare really easily so this just wasn't my thing. They definitely aren't haunted and I'm sure a lot of the stories are made up. Would not recommend going. Everyone in my group hated it. It was cool to listen to the stories and see the tunnels whether it was fake or not.