Serendipity. May-gray kept Barbara and me away from mountain hikes—too cloudy for sweeping views. A photo of an oak-canopied bridge (we do like bridges) led to a new-to-us hike in Oak Grove Park, a simple loop with a thread at the top. We should have known this hike would be different when we saw the young bunny waiting for us in the middle of the trail and the Acorn Woodpecker posing for us on the rock (birds NEVER pose for photos). We followed the West Rim Trail, stopping to watch the horses training behind the fence of the Pasadena Equestrian Center, home of the Rose Bowl Riders since 1952. Did I mention the ever-present horse apples along the whole trail? Watch your feet. The Equestrian Center grounds at the top of the loop was our turnaround point, but the eleven small bodies of water off-trail to the east on our map caught our interest. Close enough, we decided, so we went off-route to hike through a rocky, quarter mile stretch of chaparral and saw other hikers crossing a rocky stream. The "stream" turned out to be a ten-foot-wide section of the Arroyo Seco River at the center of what turned out to be the heart of the Arroyo Seco Habitat Restoration Area in Hahamogna Watershed National Park. Stunning. We rock-hopped across the Arroyo Seco and followed a trail to watershed Spreading 4. (I have no idea what the geological definition of Spreading is, but there were 16 of them on the map!) Spreading 4 looked like a little lake, separated from Spreadings 3 and 5 by a little "bridge." After we half-circled Spreading 4, we hopped the river again to return to our original trail. The surprises didn't end there. The backside of our clockwise loop led us through the Oak Grove Disc Golf Course—the world's first permanent pole hole course where we stopped for a snack, photos in a mustard field, then a trek over the oak-canopied bridge that sold us on the hike in the first place. A railroad-tie staircase put us on the trail to the car. Just the kind of hike we love: surrounded by the sounds of waterfalls and birdsong; rock-skipping the Arroyo Seco; new Spreadings; and native plants—including shortpod mustard, sacred thorn-apple, crack willow, California sagebrush, cobwebby thistle, poison hemlock, and evening primrose—in the habitat and along the trail. The entire area lives up to its Hahamogna name that means "Flowing Waters, Fruitful Valley" in the tongue of the Tongva band from the historic Tongva village that filled the area until the end of the 18th century. Easy hike? yes. So fun? So beautiful!