Pokeman is basically orienteering and similar to other sports such as golf, hiking, skiing, and whitewater rafting which use strategic thinking about a person's environment.  It's  safer than these sports but, like them,  requires an understanding of risk. A person skiing should respect closed areas and be aware of avalanche danger. Likewise a person playing Pokeman should respect private property and closed areas while being aware of traffic. I suspect the risk level is closely comparable to golf and disk golf. We should get etiquette figured out in a few weeks. Right now we are all newbies to the sport.