I rode the Green River trail, a not heavily used MUP. 6 miles downriver from where I parked to the trail's end, turn around and come back. Lovely day for a ride. Saw a hawk on the ground, lying prone but turned to stare at me when I passed. I think she/he just got a critter and was hunkered down to protect her kill. She was gone when I returned. By local standards, it was hot - to me it was warm but rather pleasant.

About 2 miles from my car realized that my rear tire was running low. I didn't hear a hiss, so thought I'd try my CO2. That sort of worked, and limped back. Could ride in faster than walking. Stopped at my LBS on on the way home and bought 2 new tubes and 2 new CO2 cylinders.