Make your travel pay for itself, look for paid employment in a national park. Go to USAJobs.gov and enter "seasonal, national park" or "temporary, national park" as search criteria to see some options. Based on the results you find, you can further filter your search to the kind of jobs that look like ones you might be most qualified for and interested in.
Note that some of the larger parks receive hundreds of applications for only a handful of openings, so your chances for selection may improve if you apply to a smaller park. Consider volunteering first to gain additional experience and improve chances of getting paid employment.
There is also a program to train seasonal rangers to perform law enforcement in areas administered by the National Park Service, see the link below.