Rapid City is in desperate need of great teachers, as is everywhere else, but being so close to the reservations yo may want to check into social work. There are cases of neglect, abuse, and god knows what else that happens on the reservations AND in the Rapid City area. I am sure they will need your experience and help.
Another member of the forum is a social worker too. BusySocialWorker is her name (how obvious
) and hopefully she can come along and tell you which direction is best!