I don't fish but it's a great route.  I entered and went to Cirrus - two easy portages - down to Sue Falls.  I portaged across to Kasakokwog - definitely the toughest portage of the loop but other than being hard to find, maybe a 3 or 3.5 on a 5 pt scale.  Saw two nice island sites on Cirrus; reported great site on Kasakokwog just to east of portage from Cirrus.  I stayed at a point to west - great breeze and views.  West end of large long island not far into Quetico Lake from K.  Looked for a reported great site by western most passage from Quetico to Cirrus - up a little stream - I had to pull it in September - and sure enough - a really great site in the northeast corner of that big pond.  The Eden Island site is reported to be very nice but perhaps overused.  Depending on your mood, the beach sites on south bah of Quetico - south of portage to BH - were interesting.   Last I stayed at was on BH - east side island clos to shore about half way down east shore of BH.  Some details in my report at (You need to Login or Register to view media files and links)

As BillConner said, a great route. Cirrus is one of our favourite lakes in the park.

One of our favourite sites used to be 3J at the southeast corner of the channel leading from the upper part of Cirrus to the lower part. It is up high and has great views west down the length of that part of Cirrus. We have stayed there countless times over the past many years. But last September we stopped there hoping to camp and found a disgusting scene which I reported on the PCD as follows...
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This used to be one of our favourite sites in Quetico. But this September we stopped here hoping to spend a night only to find large (and I do mean large!) wads of toilet paper strewn all around immediately adjacent to the primary tent site. Disgusting!!! I reported to Quetico park staff who promised to send in a crew to clean it up...
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If you go by this site and have a chance to look at it, I'd be interested in your report of its condition.

Like Bill, I am not a fishing guy, so no help there, I'm afraid.

Thanks for all the advice, I have passed it on to the group leader.  Phoenix; I will try to check the condition of that site on Cirrus.  I hope to do a trip report when I return.   I already have the title: From the Lake of Galilee to the Lake of Quetico!
I live about 10 k from the Lake of Galilee in Israel.

3J has been cleaned up. We camped there in May 2013.

I lunched at an island site at south end of the channel between lower and upper Cirrus and it was not bad.  I camped on an island site not too far west of the channel on upper Cirrus and it was nice and big enough for 6.