We thank Auld et al. for underscoring the important distinction between formal health education and health information dissemination. As a pilot program, the main objective of the Public Health in the Parks grants initiative1 was to assess the feasibility and acceptability of including public health–focused programs in park curricula. The response to our initiative was overwhelmingly positive, and in fact, we funded 5 new parks (US $5000 or less) in 2010 to address topics including lead toxicity in humans and wildlife and water quality in both lake and river environments. As our initiative expands, we recognize the critical need to engage rigorous methodologies, such as those outlined by Auld et al., to ensure quality programs that will complement the work by health educators and serve as a model for other trans-disciplinary public health activities. The 2006 National Park Service (NPS) Interpretation and Education Evaluation Summit2—the first of its kind—advocated for “creating a culture of evaluation” within the NPS, mirroring much of the evidence-based principles central to health education competencies and pedagogy. Opportunities to connect national parks and other outdoor spaces with health are legion. Besides our grants program, other recent park initiatives have included efforts to engage visitors to increase physical activity3,4 and improve nutrition,5 and to better understand the interconnectedness of human, animal, and environmental health6—a visionary movement termed One Health7 and broadly supported by the American Veterinary Medical Association, the American Medical Association, the Centers for Disease Control and Prevention (CDC), and other organizations. In September 2010, the director of the NPS commissioned an executive steering committee to explore and define the unique role that the NPS can play in promoting the health of our nation and of all species.8 Formal collaboration between park rangers and health educators is encouraged. Although 12 of 16 awarded programs in our grants initiative involved collaboration with an outside organization, only 2 partnered with a state or local health department, and none collaborated with the CDC (unpublished data). Our evaluation data1 suggest that park rangers are willing to partner with health agencies and health professionals, and such partnerships would likely improve the content quality, credibility, and effectiveness of park-based, public health–focused programs. As an initial step, we recommend convening a planning conference, perhaps co-organized by the NPS Office of Public Health and the American Public Health Association, for rangers and health educators to exchange ideas, capitalize on potential synergies, and pursue innovative strategies in true, science-based health education.