So I know you have to go to the ranger station during office hours, but can't find them anywhere. What are the office hours for the Cache Bay Ranger Station (and the others too, in case it's useful to other people)?

Check-in-Hours: Park business hours and operating dates vary between stations and operate on Central Daylight Time during the summer months. All park stations generally open the Friday of the Canadian Victoria Day weekend (third Friday in May). Contact park office at 807-597-2735 for station hours.

got this info off the interwebs.

Cool, thanks for the number, I called and it looks like Cache Bay ranger station is 8:00 to Noon, and 1:00 to 4:30. Note that the woman who answered the phone had to look them up - she didn't know them off the top of her head - which indicates to me that the hours do vary from station to station.