We did a 2 week road trip last summer, a few highlights from our trip were as follows:
Ziplining in Coeur d'alene, ID. Timberline Adventures
Virginia City, MT watched the play they were amazing, the town is very neat to walk around.
Gem Mtn Mine, got some saphires. Cool experience.
Lewis and Clark Caverns, amazing tour!
Rafted down the Yellowstone river our of Gardner MT, entered the park through North entrance way less busy then west entrance. Don't miss the Grand Canyon of Yellowstone, far more worth the visit than Old Faithful. Don't hold the buffalo's! LOL