A couple of additional random Robinson thoughts.  I do a poor job of taking notes, so if my memory in in error, please correct me.

I have come out by the Horse River to Sandpit and Mudro several times, but generally did not enjoy it much. With the exception of the Chain Saw Sisters Saloon being at the pickup point parking lot.

I also believe a campsite on the North end of Robinson was the one Sigurd Olson referred to in one of his books as his favorite in the entire Quetico.  I believe it was directly West of Gardner Mountain, with a sand beach and tent pads nearly at water level. 

There was a walking path to another site just South that might work well for splitting up your large group.  I think the site may be K3 on PP.  We caught some nice Lakers in the N/S channel near the camp.

Corrections welcomed.
MB