This is a spectacular trail, albeit not for the faint of heart. After leaving the parking area, the trail has a steady rise, then levels off to traverse a scree slope and then ascends slightly to Frozen Lake. Even after one of the hottest and driest summers in Washington state, there was a fairly thick pack of snow on the steep northern bank of the lake. The lake is the water supply for the Sunrise Inn and building complex, which detracts slightly from its stark beauty. Ascending the Burroughs Mountain trail is fairly steep for a flatlander like myself, but it overlooks Berkeley Park and its small pond. Mount Rainier itself is mostly obscured by Burroughs mountain until you reach the top of First Burroughs, where you have a suprising full view ahead of you as a reward. Had I not told my wife I would be back in 2.5 hours, I would have gone on to Second Burroughs. The downhill going east on Burroughs Mountain trail allows an almost continuous, spectacular view of Emmons glacier and moraine, with a small unnamed turquoise-colored lake for added effect. Several sections are quite rocky and it becomes very narrow through some scree slopes. Shadow lake was disappointing. From here the trail runs through mostly forested terrain, and is nearly continuously uphill back to the Sunrise parking lot. I don't remember much of this, concentrating on the fact that I was completely exhausted and hyperventilating from the hasty trip.
This is listed in the Easy Day Hikes book, and given about 4 to 5 hours, it would be relatively so. Being a middle aged Texan in moderate condition, who lives at 800 ft elevation, I did it in 2.5 hours, running most of the downhill at moderate pace. Trying to do it in the 2 hours described in the guide would reuire no stops to catch one's breath, or to admire the views, which is of course why you would want to do the hike in the first place. Plan to give this hike the time it deserves.