Hi A.,
Like Markasa, I also recommend Frankenmuth! Have you ever been there? The two main restaurants there are Bavariann Inn and Zhenders...they are literally across the street from each other and are actually connected through underground shops! They both have shops connected to the restaurants, and when you go downstairs (where there are even more shops), you can walk to the other restaurant! The food is GREAT (both restaurants have the same food/menu). The restaurants are located on Main Street, and there are many shops on that road, so you can do as little or as much shopping as you want! The shops are cute and even if you don't buy anything, its still fun to see everything. Even if you don't go any further than the shops in the restaurants, its still worth visiting!
You mentioned your husband has a disability...is he in a wheel chair? If so, it might be hard for you to visit some of the shops on main street (I don't remember how many are wheel-chair accessible, but for sure some of them are.) Both Zehnders and Bavariann Inn are wheel chair-accessible, and both have elevators to bring you to the lower level shops.
If I think of anything else for you guys to do, I will post it later...have fun, and Happy Anniversary!