There are a number of places where you can set up camp and go out for day trip loops. There are such places close to take out points such as Quetico Lake and Pickeral lake.  Start out assuming you will get there as if you were going to spend 2 or 3 nights there.  For those extra days, you can go out on day loops or just hang or leave the park early.  If during your week you go slow and you get there a day or two late, just eliminate the extra day or two at that last site.