Check out Spider Lake in Itasca County. There's 2 resorts and maybe 3 small cabins on the whole lake. It's in a national forest so there won't be any more development. Anyways, Spider Lake Resort has fantastic facilities and very friendly. There's also North Star Lake in Itasca and that isn't overloaded with houses. Both have great fishing. And if you don't have very good luck on either lake it's nothing to jump to another musky lake close by.

Good luck.