Some of this is on the way and not in the area. Lake Superior is an incredible body of water.
The glass bottom boat isn't the most exciting thing but I enjoyed it. There is a history of ore shipments on Lake Superior and how many were lost in storms.
TourFind your way onto Miners road that takes you out to the north east side of Miners Rock and Miners River. Go on a hot day and swim off the beach on huge boulders to the left side of the beach and the NE side of Miners Rock. It's always cold but 15 or 20 feet of crystal clear water and rippled sand bottom.
There are hiking trails that may be called Mosquito Falls. It's been many years so I cant remember but they are probably south west of Miners Rock and off of road 695. The shoreline is shallow water over an all rock area and then drops off to about 40 feet deep. There were large lake trout swimming around at the bottom. I had snorkel and fins with me. Yes the water is ALWAYS cold, it's Lake Superior. The path we took was about a 7 mile hike.
The beaches along US2 when heading west from St Ignace are nice.
There is a pull off on the west side of the Cut River Bridge on hwy US2 that is nice. Good swimming spot.
Climb Castle Rock in St Ignace.
I like the boat ride from St Ignace to Mackinac Island even if I didn't go to the Island.
If on the island, the Pink Pony has good food and great long island ice tea.
If you take the boat from St Ignace to the Island, check the schedule as some trips go out under the bridge before heading to the island.
At times and in certain areas the black flies and skeeters are horrendous. I have never had a problem with them in the Pictured Rocks area. I have experienced them along Superior west of Whitefish point. It just depends. Go prepared.
Grand Marais is nice. Very picturesque and many will kayak on the bay at times.