You need to book permits for this if you are planning on backpacking, and you must have a bear barrel with you to complete it! Before the hike, you need to go to the Tombstone Interpretive Centre to check in and get a debrief of the hike!
You can do the 5km trail to Mount Monolith Viewpoint, which is the first 2.5km of the trail! It is stunning in the fall (early August), and if you go on a weekend, there are usually many other people out hiking, so I have always felt super safe on the trail!
This is a challenging trail, and if you are planning on going to Divide and Talus, you must be comfortable hiking down scree slopes and with wayfinding.
I have done this as a multi-day backpacking trip and as a day hike, and both are great options! If you want to hike to Grizzly Lake as a day hike, you need to be physically capable of a 22+km day with rocky terrain and steep inclines!
This hike is honestly insane, and I believe everyone who is physically capable of doing it should if they have the chance!! You may also be able to see some marmots along the trail and hear them whistling around you!