Where? : Alum Rock Park is one of California’s oldest municipal parks (San Jose) located at the mountain foothill part of the east San Jose.
What? : The park spread on both sides of Alum Rock Canyon, Upper Penitencia creek, in the foothills of the Diablo Range. You can hike the well maintain shaded trail near the river running water, enjoy the picnic area, visit the mineral springs or hike on the hillsides trails.
When? : year round, also good for summer day, the trail near the river has shade.
Due note: Interesting section of cliff side mineral water springs. Bike friendly park.
My thoughts: nice and nearby park to visit, interesting history. It is nice to hike the main trail in the “canyon”, the upper trails are nice but not a must.