I am not from there and have only been to the UP once, on a vacation in summer 2018. I did not try to do any fishing. highlights of my trip are as follows:
1.) going across the " Mighty Mac " coming in from the LP and then returning on it later in the week. One of the world's great bridges.
2.) Primitive camping on Grand Island. We reserved it for 2 nights but got poured on with a big thunderstorm the first night, so we decided to just enjoy swimming and kayaking the next day and not stay the 2nd night. The island would have been great to explore further if we had the time.
3.) The swimming around Grand Island was absolutely perfect. Refreshing, gin clear water like I have never seen in any big lake in NY before, and not the bone chilling cold water of the main lake. I'd say the water temp. was 67 F that July.
4.) 6 hour kayak trip departing from Grand Island - kayaks rented from the campground office.
5.) Spent a day driving east from Munising om Highway 58 and stopped frequently to see Munising Falls, Miner's Castle, 12 mile beach, Grand Marais and then all the way to Whitefish point to visit the Shipwreck museum.