We have not been a host but have been to Presquille PP many summers and have stopped and talked with the host a number of times in their spot next to the lake. There is an application process along with a background check (you will be dealing with kids, unfortunately that is the reality now). You have to be in a position where they tell you when they need you, read into that retired/slef-employed. You should have a level of knowledge of that park and surrounding area where you are part tourist guide and part samaratin when things go bad. Luckily the park people do the day lessons and activities. I have seen them on bikes around the park with their red vests, so obviously you need to be social and be able to talk to people. The spot in Presquille is no electricty so you will need solar/generator, not sure about other parks. I have also seen the hosts at Mew lake in Algonquin and much of the same there so it must be a Ontario wide standard for that "Job"