We tried to get this going a few times and had a few pretty good GTG's. We more or less used mis-dig flags and marked out a course that would direct you through different challenges. This can be done almost anywhere, city parks, state land, your yard. A lot of guys call these "G6" runs and it has a whole set of rules that can be followed as serious or relaxed as the group wants. If we can get a few guys and girls together this is really fun, keep in mind some of these courses can go up to a mile or more if you want.
Good place to start:
Here is a few links about the "G6" scale comp rules: