I haven’t been there in years, but my buddies and I used to go to Silver Rapids Lodge in Ely every year (White Iron Lake and Kawishiwi river connecting Farm and Garden Lakes). They have great camping site options, it’s crazy cheap (at least it used to be), you have dock access and you also have access to the resort amenities like a bathrooms/showers, Lodge, Bar/Grill etc.
I know the resort has been in the news lately because they want to greatly expand it into a Grand View lodge type of thing – which is sort of a polarizing issue up there. But I believe it’s still business as usual until they get that figured out. Give them a look. Great fishing! They also have a beach/swim platforms etc for kids.
Otherwise, if you want to rough it a little more. go with Kab or Namakan in Voyaguers. Just book a boat-in site and you’re golden if you don’t mind beaching your rig.