Grinnell Lake and Lake Josephine via Piegan Pass Trail is a 21.9 mile lightly trafficked out and back trail located near Siyeh Bend, Montana that features a lake and is rated as difficult. The trail is primarily used for hiking, running, and backpacking.
https://www.nps.gov/glac/planyourvisit/statusupdate.htm. Glacier National Park charges a fee to enter. Fees are per vehicle or per motorcycle, with different rates in the Winter. If you are entering on foot, horse, or bike the fee is per person. You can also purchase a park-specific annual pass. Winter rates are in place 11/1-4/30.
The smoke was not a problem, even though it was just over the hill. The trail showed obvious signs of heavy usage, but was also well maintained. The signage made the path obvious. There was very nearly stairs all the way to the top. I saw plenty of folks over 60 doing the trail, even all the way at the top. Most folks turned back about halfway, but there were a ton of people. However, it was not too crowed. We found a parking spot at the bottom without waiting. I think that this late in the season it is less busy and crowded. The views are incredible, even with smoke. All the way up, there's an un-blocked view of the granite peaks. The glacier at the end is awe inspiring.