I've done the west coast of Michigan a couple of times and it is one of my DW's and my favorite places to go. You can't go wrong with virtually any of the Michigan state parks touring up the west coast heading towards the UP. One of our favorite parks is Wilderness SP, 10 minutes from the bridge to the UP. Some incredible waterfront sites right Lake Michigan, however, if you don't get one of those prime sites the rest of the that section can be small, tight and packed. The forested area is much nicer, beautiful actually, and the sites are much bigger and well-spaced. From Wilderness, you are only a few miles, maybe 8, to Mackinaw City. A great town that has RV parking right in the center of Main Street. Many fun shops, pubs, and restaurants to suit any fancy. Tour boats to take you over to Mackinaw Island. If you have bikes, bring them with you, they charge a small additional fee for them. Bike around the island, no cars allowed, it is an 8-mile ride and it is beautiful. The town center is filled with pubs, restaurants, and shops also. Fun place to spend a half-day or so. In the UP we stayed at Indian Lake-South SP. The site we got which was the last one available, is to this day the most beautiful campsite we ever stayed at. Right on the banks of the lake, with stairs cut into the bluff to take you down to a small beach area. Nearby is a natural spring, I forget the name but it quite the attraction, so much so we didn't get to see it because there were so many people, peak season mid-July. From Indian Lake it is only about 26-28 mile ride to Pictured Rocks National Seashore. You need to take a tour boat to see the "rocks", but it is well worth the price and boat ride.
From Indian Lake, we made our way up to Tahquamenon Falls SP, close to the Great Lakes Ship Wreck Museum. Real nice large SP with big spacious campsites. A short walk from your campsite is Tahquamenon Falls. You can rent a small rowboat to take you across to the small island in the center of the 3 falls. Beautiful! we used our kayaks, which was a bit precarious.
Enjoy your trip and I hope these suggestions help. I could go on and on about Michigan but I would have to look up all the great places we visited up the west coast to the UP.
sherman12 and The Fabulous Miss Barb
2014 SportsCoach Cross Country 360DL DP
Former 2011 Georgetown 330TS
Kia Sportage on MasterTow Dolly