Outdoors · Alta Loma
Heritage Community Park
41 acres in Alta Loma with a working equestrian center — the park where you can usually watch horses.
Heritage Community Park's distinguishing feature in a city of good parks is the on-site equestrian center: 41 acres in Alta Loma where you can usually watch horses being worked while the kids do the playground circuit. For a suburb that used to be citrus and vineyards, this is the park that still carries a trace of the old land use — literally, if you're downwind of the arena.
The park's 0.7-mile trail connects to the Cucamonga Creek Trail, which makes this a legitimate starting point for a longer walk or ride rather than a lap-the-parking-lot situation.
It's free, dog-friendly, and open daylight hours. Come with time to stand at the arena fence — seeing the horses is most of the charm, and it costs nothing.
Nearby & related

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Pacific Electric Trail
Twenty flat miles of rail-trail on the old Red Car line — the best free activity in the city.

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Red Hill Community Park
48 acres on the Red Hill slope: a duck lake, pickleball, an amphitheater, and a mile-ish exercise loop.

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Route 66 Trailhead Park
A pocket park on the old Route 66 alignment doubling as a Pacific Electric Trail access point.