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Wagosh lake is a relatively shallow fertile lake. It has lots and lots of smallish northern pike and real easy to catch. The water has significant algae in the summer so much so that you would not want to drink it unfiltered and then a good prefilter would be prudent or you'll clog your main filter quickly.
The one campsite on the lake is pretty good. It has a nice high view of the lake but that means hauling all your stuff up there too. It's really only about 20' above the water. Swimming wasn't so good from this campsite because as soon as you went in the water you stirred up a bunch of sediment. Still my wife and I had a nice stay here for one night in 2007.
The campsites on the other small lakes between Friday Bay and Wagosh did not seem as nice.