Good advice so far!
Large kitchen tarp? Yes.
Bits of advice I will offer:
1. Take a "sacrificial" small blue tarp to string over the fire in the event of torrential rain. Sometimes outfitters will have dollar tarps from the previous season for sale.
2. Depending on the site, you may not be able to all hang under one tarp with your happocks. Better to be able to hang where you are able with individual setups.
3. Crazy Creek-type chairs are worth their weight on portages for the comfort they provide at camp. Sitting on logs around the fire ring gets old. A plus is that you can use them laid flat as doormats under your hammocks.
I hope to be in the BWCA in August as well. Maybe we will cross paths. Have a great trip!
PS: The big kitchen tarp is really appreciated if the weather turns foul. Like for sleet & rain in May.