From time to time I've spoken about the No Limits coaster simulator, which as an aviation buff I enjoy very much. It is arguably the best Point of View and third person coaster sim, I never found anything that came close. The author, Ole Lange, has been very supportive in creating a sim where you can not only ride, but design your own coasters as well.
This video is a recreation of Kumba, at Tampa's Busch Garden. It is my favorite real life coaster due to both the inversions and speed as one rushes close to the ground. I will be posting a few more recordings, which speak more praise about the sim than I can verbally.
John