I ran 6 miles, keeping my heart rate under 70% of heart rate reserve. Since my left calf has been acting up on me a little bit (it has a tendency to get very tight, even with lots of stretching), I walked up and down the large, steep hill out of the Isar River Valley, because I didn't want to put any added stress on the calf muscle. So I ran 1 mile, walked down the hill, ran 3 miles, walked up the hill, and then ran 1 mile home.
I was very happy with my splits for the first three miles. Looks like my speed is finally starting to come back, although I'm still very slow.