Good info. Thanks. Since we are likely planning some time in March, Kalamazoo might be best as the others would do better when the weather is nicer and one can enjoy the water closeness.
These things require a car or taxi, but just in case you feel like checking them out:
Gilmore Car Museum - pretty much what it says. It's halfway between Kalamazoo and Richland, so this would require a rental car.
Air Zoo - about a $10 cab ride from downtown. They have planes/jets from every decade (mostly military planes, including an SR-71B Blackbird).
These are all downtown. If you stay at the Radisson, they're all within walking distance:
Alamo Drafthouse Cinema - they show new and old movies, serve drinks (alcoholic and non-alcoholic) and food right to your seat, have a strict "no talking, no texting" policy, and don't admit teens unless they're with their parents. We LOVE this place. I'm not sure when you'll be here, but they have a really fun trivia night on Wednesdays.
Kalamazoo Institute of Arts - they have a Chihuly glass sculpture in the foyer.
Kalamazoo Civic Theater - local actors
Kalamazoo Symphony Orchestra (KSO)
Miller Auditorium - this is on WMU's campus, a short cab ride from downtown. Several buses service campus as well. Miller hosts professional productions, like "Stomp" and "Blue Man Group". The KSO performs at Miller as well.
Bronson Park is surrounded by gorgeous, old churches and government buildings. (The Civic Theater sits on the SW corner, and the KIA is kitty korner from the park.)
Kalamazoo also has a "pedestrian mall" downtown. It's full of boutique shops, cafes, restaurants, and bakeries.
Oh, and if you're a fan of libraries, check ours out.
The main atrium is absolutely gorgeous and modern, and the Children's Room and Local History Room were designed to reflect their content. I've been going there for 18 years, and it still takes my breath away.
I mentioned Stuart Avenue Inn and Henderson Castle, but I forgot to mention another favorite:
Kalamazoo House. This B&B is right downtown, so you could walk to pretty much everything. It's next to the KIA.