I used the BH parking lot in Sept. I went in Saturday afternoon and had a hard time finding a place to park. No touble for me leaving the car there, but I would not risk leaving anything you could not stand to loose.

Lots of Walleye in the areas suggested, not many small ones though. ;D
Might be a little slow later in the summer.

You could easily spend 10 days exploring/fishing either Cirrus or Quetico and burn a few of them with short day trips to good nearby lakes.

I'm planning to enter Nym next year and work my way through Pickerel down to Sturgeon then back out through Lonely, Walter, etc.