Camp L5 on Tuck could accommodate a large group. Site is high above the water on a large flat area atop a twenty foot cliff. Great, dramatic views. Numerous tent sites. Best landing access is to the north of the site. Good swimming off of ledge rock close to the water some 100 yards south of the main site. Only drawback to the site (beside the steep scramble up the slope to get there) is that the woods are so thick behind the campsite that using the "facilities" can be a bit of an ordeal.

On Robinson HN and HV are average sites capable of handling large groups. J9 is a beautiful site also capable of large groups. JR is an extended site or multiple sites- the main location is on the bump on the east side of the island not at the southern tip. This is the best site for large groups on Robinson. It is vast. Also a very pleasant site, especially for a big group.

The site GN on Moose Bay is well used with dramatic elevated view across Moose Bay. Good place for big groups. Room to roam. A note that Azalea means Crooked Lake rather than Basswood Lake in his post. I routinely spend my last night on Robinson (or first night in the  off season) when exiting via Mudro. It is about 7 hours of travel at moderate pace double portaging from the middle of Robinson to Mudro landing.