Rock Island is so amazing!! It is very secluded because you have to take a ferry over (actually, two!) and the campsites are hike-in only. 

We would highly highly recommend! Our campsite was absolutely perfect, up on the cliff right over the water in a wooded area with a path down to the water. 

It was great, we would hike all day and then come back to watch sunset over the lake. The stars were also incredible! 

We had lots of friends (deer, snakes, toads)! 

We also enjoyed seeing the lighthouse and boathouse. We did self-tours of both and it was so fun learning the history and looking around!