On our first day trying to get into Glacier they were full. They had most of the park open, but not al of it, and only were allowing a certain number of visitors in for COVID precautions.
Instead we turned just outside the park, found some parking, and walked along the river path there. It was beautiful, secluded, and fun. My favorite part was checking out all the different colored rocks.
Then we spent the rest of the day back at the air bnb.