Whoa, those all sound intense.
I once designed a shuttle loop between two tall hills. Each end went up the opposite hill. If I am remembering right, I think this allowed me to go higher because I used the terrain to my advantage. I then purposely made the end a little bit too short. The test run wound up being the last run. The train jumped wayyyyyy off the track and crashed in a huge fireball. However, once I fixed it, no one seemed to want to ride my Evil Knevil coaster. I do not know what the intensity rating was, but if everyone dies, things must fairly intense. ;)