My story is set present-day at a fictional boarding school roughly halfway between the turnoff for Killarney off of Highway 69 and Killarney Provincial Park. It's the second weekend of September and two experienced instructors are taking a group of 20 students on a weekend camping trip in or near Killarney Provincial Park.
1) How feasible/legal is it to just drive off the main road, park by a river (the Murdock River, for example, is just by that turnoff) and set up camp? Does it need to be in a designated campground, or is it okay, so long as you're not on privately-owned land? (They really don't want to run into other campers, but if this isn't feasible, I'll just set it inside the park and deal.)
2) I've Googled enough to know that at this time of year, daytime temperatures are 20-30 degrees C (68-86 F) and nights 5-15 C (41-59 F). How about humidity? I went up there this summer and although the temps were in the mid-20s, due to the humidity, it felt a lot warmer. Would this also be true in mid-September? And what sort of clothing/supplies should they take with them? (The seasoned instructors will give them checklists as far as clothing is concerned. The school will provide everything else.)