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You don't have to say which specific campsite you will be staying at but I believe you do have say which lake you will camping on each night.

Kerry makes a good point here. You do need to tell them what lake you plan to stay on, then it's first come/first serve from there.

Don't worry about finding a campsite. ;)
There marked with a big ( orange I believe) campsite marker that can be easily seen from the water.
I bring a small pair of binoculars and they really come in handy for situations like this.
You can see the campsite markers before you could pick out activity at the site, especially if tents are set back into the sheltered areas of site.
I saved time/energy by scanning for occupancy before fighting wind/wave only to find the site occupied.

No where near the Q/BWCA experience as far as chances for solitude, but a little planning and for a base camp trip for newbie's, it could be a great trip.
Don't confuse being well used with not needing to use your wilderness skills, especially when it comes to securing your food cache.

The bears there are big, plentiful and know people=food. I'd bring Bear Spray for sure and hang your food pack a good distance from campsite.
Not to scare anyone, but there have been a number of fatal bear encounters in that park so plan accordingly.