I have stayed at the American Club in Kohler half a dozen times for business in the last ten years. It is an absolutely lovely, serene environment. The service is exceptional. Very tasteful and high quality-oriented. It is owned by Kohler (of bathroom fixture fame). There are several categories of rooms which get progressively more elaborate as far as the space/and yes, the bathrooms go. Spring for something in a higher category than the "base" if possible. Don't get me wrong, there is nothing bad about the lowest category of rooms, it is a very nice room. (European comforters are standard, etc.) I have two children (ages 6 and 2) and would not bring the kids. There isn't that much of a kid focus. Plus, the environment is more refined than it is stimulating. They offer exceptional golf, a comprehensive sports core/spa, horseback riding, etc. Oh, I almost forgot: The Design Center will make you want to remodel your bathrooms and kitchen at home! People schedule visits for the sole purpose of spending time at the Design Center when building or remodeling. What time of year are you planning to go?
(My former company used to host a get-away there. They tried to move it to a different location one year, but guest feedback strongly urged them to move it back to the American Club. That is just one indication of how nice it is).
Have fun!