I don’t know what your dates are, and a lot of stuff is currently shut down, but I’m originally from southeast Michigan and have a few suggestions:
Traverse City and the Leelanau Peninsula have a ton of wineries. I haven’t been since before I was 21, but I will say that the wine I’ve had elsewhere is very good.
If you visit Mackinaw City, I suggest at least one night there, and make a day trip to Mackinac Island. You might not be interested in biking around the island, but they have museumand historical sites related to Fort Mackinac, which was a successor to Fort Michilimackinac in Mackinac City. The island is just really pretty.
Frankenmuth is an adorable town that is steeped in nostalgia for me, so I’m biased. Like Skippyboo said, Bronner’s is a massive Christmas store. There are these two “waring” chicken dinner places: Zehnder’s and Bavarian Inn. Let me tell you a secret: they’re pretty much the same. In fact, the matriarch at Bavarian Inn is currently Dorothy Zehnder. Zehnder’s is more kid friendly and feels more chaotic; Bavarian Inn is a little calmer and has a few different additions to the menu. As someone who has done both, I have a huge nostalgic pull for Zehnder’s, but I do appreciate the feel of Bavarian Inn.
The Henry Ford Museum and Greenfield Village in Dearborn is another super interesting history stop. The museum has rotating exhibits, but they always planes, trains, and automobiles. (It’s Michigan.) The Village is an outdoor living history museum. It’s filled with reconstructed buildings and homes including a replica of Edison’s Menlo Park, the Wright Brothers bike shop, and Noah Webster’s home. If you have to pick one, I’d choose Greenfield Village. Bonus: I didn’t learn this until the past year, but Greenfield Village was an inspiration for
Disneyland’s Main Street. Walt visited in the 1940s.