Schollenberger Park Road
5 paikallista suosittelee,
Nice flat walking/biking paths that run along parts of the Petaluma River. Great birdwatching.
If you are looking for less of a hike and more of a flat easy walk, head for Schollenberger on Petaluma's East side. I run here every couple of weeks. To extend the loop a bit, try parking near the trail head in the Hilton parking lot.
Lots of birds to see and an easy 2.2 mile around the "water" if it's not dried up.