Anywhere in the BWCA. Seriously, just show up, get your permit for any entry point and go.
Otherwise, you don't need permits for the Twin Lakes just outside of Grand Marais. Feels like the BWCA, looks like the BWCA, has campsites like the BWCA, it's just outside the BWCA.
YakCatcher Rod Holder
PFD's (Life Jackets)
Free Standing Boat Racks