It is certainly prudent to be sure that there is O2 available; I am sure there are several backup canisters available, due to the popularity of scuba diving in and around the park.<br><br>For what it is worth, I seldom read of problems at Isle Royale on the NPS Morning Report, a daily roundup of rescues, emergencies, and unusual events around the Service. Lots more action at Lake Mead and Yosemite.<br><br>I'll bet you will enjoy Windigo. It's low key and friendly - a lot like many parks were thirty to fifty years ago.