I had some time off in October from work so I kept an eye out on the weather and chose a few days where the lows were expected to be above freezing. The permits were easy to get, I decided to take my trip on a Tuesday and I was on trail the next day.
Day 1: Luckily for me, my mom lives in Bishop. She walked me halfway to Blue Lake. I believe it still counts as a solo trip when your mom walks you halfway to your campsite?!?
The fall colors near Lake Sabrina were gorgeous.

The hike to Blue Lake is a little over 3 miles. I set up camp near Blue Lake and then headed out to Donkey Lake. The trail was well marked and I had AllTrails and a printed CalTopo map I made for backup.
Donkey Lake

Blue Lake (convenient access to water)

Blue Lake in the evening

Day 2: Between the sun setting early, the cold coming in quickly, and being alone, I went to bed early both nights. I spent a good 12 hours in my tent. Some of my time was spent reading before bed and in the middle of the night. Although it got cold quickly as the sun went behind the mountains, the daytime temps were excellent, in the 60s with strong sunshine.
I originally planned to pack up camp and hike to Midnight Lake on day 2. Between the weight of my pack - solo hiking meant no one to share equipment with and October weather meant lots of layers, a warm sleeping bag, and two sleeping mats- and the reality of hiking at a higher altitude made me decide to stay at Blue Lake and do a day hike to Midnight Lake by way of Dingleberry Lake. (I'm looking forward to checking out Hunger Packer and Moonlight on my next visit!)
The trail is clearly marked except when traversing sections of huge boulders. Sometimes rocks were marking the trail as shown below, other times I had to guess and use my phone for support.

Dingleberry Lake hiding in the middle

Midnight Lake

Day 3: I woke up on my final day and packed up. It was a Friday so the trail traffic increased significantly from the prior days the trail back to Lake Sabrina. In contrast, I only saw one couple camping near Blue Lake and a small group that was looking for a site plus a few other day hikers. On the hike to Midnight Lake, I saw two people the entire time.
I made it back to Bishop well before noon and had a great dinner with my mom at Mountain Rambler Brewery.