What Should I Do With My Nephew Coming to Missoula?

My little nephew Colby is 11 years old, and I have no idea what activities 11 year old kids find fun. Colby and I have a great relationship and I am sure he would be happy doing anything here, but I want to make his time here special. He has been to Missoula before and we took him to a Missoula Osprey game which he really enjoyed. He plays baseball for a team near Seattle, and with the weather so nice I know we will be playing ball outside. Colby enjoys video games like every kid his age but he isn't attached to a device so I would like to do more exciting things than sitting in front of a screen.

What do you think an 11 year old would love to do. Even if it does mean traveling a bit, I don't mind, I just want to have a bunch of fun while he is here this weekend. Any suggestions you can send my way would be greatly appreciated!