I\'m watching this thread, we are looking for an adventure July 20-28th or so.
If you have extra time, the Old Montan Prison in Deer Lodge is fun
Old Montana Prison As well as Fairmont Hot Springs
Fairmont Hot Springs Resort
There is also ghost towns nearby at Southern Cross 46.21018, -113.23642 and Granite 46.31682, -113.24649 and Garnet 46.82531, -113.33910 as you get closer to Missoula. My kids love exploring them.
There is also Gem Mountain Mine further west 46.24737, -113.59195 where you can mine sapphires and head down into the Bitterroot valley on the beautiful Skalkaho Pass.
As you can see, no shortage of stuff to write home about!