I believe the acceptance of new ideas depend a lot on the individual river "ranger" the first few times a new idea is deployed. From there, a lot of its future will depend on the feedback those individual give in the employee meetings with each other and with "overhead." Sell the idea as one that will make the NPS look good. Remember their priorities: "First, last and always, CYA. Second and not really separated from the first, make your overhead supervisory ladder look good." And inescapable in the final scheme of things, remember that if it gets all the way to the clowns in Washington D.C., the National Park Service can become quite indistinguishable from a Police State. That was, in fact, the very definition which the late Charles Peterson, a Superintendent, was sorry to use upon his retirement after a 40 year career with the outfit. In that 40 years on the inside, he had seen it evolve. That was 30 years ago, and in many ways it has changed, but has become no better. It's just Government. Should you ever disagree, just roll with it. It probably isn't them who is being the fool.
Be kind, gentle, and be understanding. And in all things be flexible. "No Problem, Guy! We always appreciate the ideas and the help!"