We spent a two-night weekend at Thunder Valley Inn and absolutely loved it. We have already recommended it to several friends. I am so glad that I did not let that recent 1-star review deter us.
We were in the Swedish Hus, in the room with the jacuzzi. It worked well (which is not always the case when rooms have them). We had a kitchenette, lots of space, the room was filled with books and brochures and fun decorations going along with the Swedish theme. The one drawback was that we could not find any drawers for putting clothes, but there was enough flat surface that we managed just fine. Although the room is in the direction of a larger road with traffic, this didn't bother us at all.
The breakfast is fantastic, remember to show up at 8am for the meal with other guests. Anita, the hostess, will entertain. The food is absolutely delicious.
If you can include a Sunday morning in your visit then do so! The Sunday brunch is included in the room cost and is absolutely terrific. I have never had French toast that good and you also get various Scandinavian specialties in addition to the more usual items like eggs and sausage.
On Sundays, there is also a Farmer's Market from 9am on the grounds from various vendors selling veggies as well as nice mementos and bath products.
Note that there is a coupon for 25% off some local attractions in the room so be sure to pick that up before you head out for a boat tour or whatnot.
I am quite certain we will return to this place as it was an integral part of our perfect weekend.