The first thing to note about the hike up to Grassi Lakes is that there are two ways up.
Upper Grassi Lakes - the easier trail. A wide, well graveled path, gradual elevation, very little shade.
Grassi Lakes Trail - the harder trail. A narrow dirt trail, sometimes covered with uneven rocks that can be slick depending on time of year, occasional areas of steep elevation, but…great views.
Some people go up and down the easy way. We went up the harder way and then came down the easy way, which worked perfectly for us. Most of the pics from this post are from the way up Grassi Lakes Trail because it is definitely the more interesting of the two routes.