I've got a few spare minutes, so I wanted to post a few thoughts after my trip to North Fox in my Cessna 150 last Sunday, 9/20/15.
First, I would NOT recommend taking this trip in a 150 as I did. Although the runway is completely grass covered, it is very soft, and I noticed all the planes there, including mine, sunk in. Problem is that the 150, with barely 100 h.p., doesn't have the power to "un-sink" itself, and I had difficulty taxiing and getting it up and going when leaving. I also flew there alone with only about 10 gallons left in the tanks when I got there, which helped, but I also had about 100 lbs of camping gear and a large telescope, so less fuel weight didn't help a lot.
The Island itself was fantastic. The runway is very nice, and appears to have been worked over with much effort from the volunteers. Lake Michigan kept things warm overnight too, with overnight temps on the Island in the 50's, while at my house north of Detroit it was in the 40's. I saw many ducks and geese, and lots of butterflies too.
The reason I went to the Island was for star viewing, and let me tell you, on North Fox Island there is no better place east of the Mississippi to do that. The stars were incredible, and the views through my 10" telescope were breathtaking.
Tim