Even if you're not a fan of beer, the food is amazing, and they have a number of wines, ciders, and non-alcoholic options!
Completely outdoors, but a great daytime activity if the weather is nice.
Voted the #1 Motorcycling Road in the US due to it's gorgeous views. Download an audiobook before you go, because you WILL lose cell service, and take the time to stop at the scenic pull-offs to get the full effect of the gorgeous views.
The NE/Cooke City entrance is closest to Billings and Red Lodge.
The North/Gardiner entrance is closest to Bozeman and Livingston.