I would bet anebel is right. If he's just "looky" and a bit bored, not to mention in fairly new surroundings, interesting work is the best thing for him. Mix it up, and give his brain a job. On a side note, while earplugs may be great on an ADD horse, I'm wary of them on a truly fearful, spooky horse though, because in my experience, spooks are MUCH worse if something startles them that they didn't hear coming first. Being prey animals, they depends so much on their hearing, it seems the plugs would make them more fearful, rather than help.
"Keep a leg on each side and your mind in the middle"