A day with a hundred options for you. There are local outfitters who offer kayaking in the Pictured Rocks, plus several local tour boat operators. In addition, if the group allows, we might even pool our resources as a group and get our own pontoon boat ride for the morning.
If water isn't your thing, we have some self-guided bike rides in the area to offer, plus there are numerous waterfalls in the city to walk to. Munising is also a quaint town, and you could spend the day reading in a local coffee shop.
We'll have a group picnic dinner tonight at the gazebo, near the bandshell where there is usually music playing. It's fun!