Hi, Jackfish.  I was to Sylvania once.  We entered and stayed on Crooked the first night. The next day we portaged to Clark Lake, followed by a couple of short portages through Glimmerglass and Hay Lakes to Whitefish Lake and camped there. Then we backtracked to Clark and spent our last night there.  We did a lot of day trips.  The portage from Crooked to Clark was about 112 rods, and the one into Whitefish was about the same. Both were smooth and wide.  Most of the other portages were like 10 - 40 rods, just as easy, just as wide.  The portages are actually old roads.

The three campsites we stayed in were fine.  Nothing special.  I think they see a lot of use.  The campsites are all named by the way.  We stayed at Badger (Crooked), Perch (Whitefish), and Balsam (Clark).  Since they are assigned, we didn't check out any other sites.  It was Labor Day weekend, nearly all were full, and we didn't want to impose.  They all looked pretty similar.

These lakes are pretty small compared to BWCA/Quetico standards.  You could probably do a third of the park in a good day.  BTW there are hiking trails throughout.  When we were short of water at the Clark Lake campsite, instead of filtering some more, we hiked the trail to the campground on the northern end and filled up there.

If you're going for a paddle, or even an overnight or two, you'll have a pleasant time.

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