This is something that I have been looking into lately - how to enrich the environment for snakes. One thing that seem get them going is exposure to different scents. I have bird feeders out back - sometime I put out branches and towel for the outdoor critters to scurry over and then put them in the snake cage. I also have taken items from a female snakes cage and put them in the male and visa versa. They really get stimulated by the latter.