It was cold. Not cold enough to put on more clothes, but cold enough to be annoyed that I didn't have them.
I had to carry shit. And wear a headlamp.
There were no numbers counting in front of me. I put a c25k app on the new phone, but it sucked and I had to keep turning the phone on to see what was happening.
There were hills. Tiny hills, mind you, but still hills. There were also obstacles to be avoided.
Running with headphones sucks.
I encountered a potentially-dangerous two-legged vermin.
That car that sounded like its brakes didn't work as I crossed the street in front of it didn't make me happy to be out there.
I had no control over pacing. At the end of the first running segment, I was massively out-of-breath and almost ready to stop. I tried running slower on the second leg, but it didn't work and I quit after 60 seconds and headed home.
It took me 15 minutes to get home once I'd quit.
Yes, the boats on the estuary were pretty, but it's totally not worth it.