Park Staff hang out on the OMNR Low Band system. Channel 9 in particular (46.760MHz, PL of 110.9). This channel is monitored by all Park Wardens / Conservation Officers / Park Facilities (IE, parks offices, maintenance, etc...), also Whitney OPP has their vehicles equipped with a radio on this channel. The OPP Comm Center can also come up on the repeater via a telephone interface - if there's an incident involving something to do with the park, they often come up and announce something like "Attention any Highway 60 Park Wardens, we have a 2 vehicle MVC at KM 35, OPP and Ambulance are enroute". They also use Channel 7 (46.780 PL 110.9) for simplex. There is also a repeater licensed on 46.940, however I've never heard anything on it.
MNR and the Algonquin Outfitters montor Marine Channel 68 (156.425) in Opeongo Lake, though the range is pretty limited - but it's fairly active. I would imagine should you be within the area and something happened, this would be an "okay" way to get help.
Also, I doubt you'd be able to pick this up unless you're in the northern part of the park, but there is still an IMTS system (pre-dates cell phones) that runs on 152.705/153.505/153.395. I heard activity as recently as 2013 on there.
But! Put the radio down and have fun!
Off topic, but incidentally, if you're camping, there is a guy just outside of Whitney that will let you fill your trunk for something like $15. 188 Paradise Road, Whitney.
