I rode my bike to the downtown Y again. It was mostly fun on the way there, though big vehicles coming close to me still make me nervous. Still much better than the first time. This is going to be do-able.
At the Y I did intervals on the elliptical:
5 min warm up
4 min 125-145 BPM (zone 3), then 1 min 145 - 155 BPM (zone 4)
[repeated 4 times]
5 min cool down
Then I biked home. I could really feel the ride home.