We have done green before. Our last trip my 10 year old son really wanted to try orange so he did it with his sister. He is a ride daredevil and loves coasters and never got motion sick at all (even doing RNRC multiple times in a row). He got horrible motion sickness on the ride and ended up spending over an hour in first aid and the rest of his birthday trip in the hotel. He is now too scared to go on any motion simulators or big roller coasters. His is an extreme case but I would have definitely stayed away if I had known how bad it could be.