My wakeup HR was 51 and I felt great. I ran a comfortable pace and just enjoyed myself. I didn't drink any liquids during the run but think I will in the future due to the heat. I sweat a lot and need to replenish my liquids. My T-shirt was pretty wet when I finished.
At my turnaround, I saw a large stick on the ground and threw it in the canal and watched it float downstream. I reminisced about my childhood and floating sticks in the irrigation ditches on the way to school. It's great to be old because I can do things like float sticks in a canal :)