The community of Fallbrook has a lot going for it, including a charming downtown area and hills covered in citrus and avocado orchards (it’s the self-proclaimed avocado capital of the world, after all). But the standout is the Santa Margarita River that winds along the northern end of Fallbrook. The river is one of the few perennial rivers in Southern California, so you can find water flowing here year-round. The area is gorgeous; I was surprised by how green and lush the vegetation was, even after a hot summer. An easy 5-mile trail winds along — and sometimes through — the river, passing under shady oak trees and offering several benches to stop and enjoy the scenery. For the most part, this out-and-back trail is easy to follow, but there are several paths that lead to river crossings, where water levels can get high and rocks can be slippery. Most sections of the Santa Margarita River Trail South are shaded with oak trees. (Maura Fox / The San Diego Union-Tribune) The Santa Margarita River Trail Preserve is managed by the Wildlands Conservancy, which maintains open-space areas across the state. There are about 70 species of special concern in the Santa Margarita River Valley, including several birds and the arroyo toad. Efforts are underway to bring back the endangered Southern California steelhead trout to the river, which is located near the end of the fish’s range. To begin, park at the lot off Sandia Creek Drive, just southwest of the intersection of Sandia Creek Drive and Rock Mountain Drive. The address is 4251 River Edge Road. There’s a portable toilet and an information kiosk at the Sandia Creek trailhead, which is located on the southeastern side of the parking lot. Start hiking on the Santa Margarita River Trail South. Throughout the hike, you’ll pass by wooden trail markers, which signal the river crossings and help to ensure you’re staying on the correct path. It also may be helpful to grab a paper trail map at the information kiosk before setting out. The Sandia Creek trailhead, where the Santa Margarita River Trail South begins. (Maura Fox / The San Diego Union-Tribune) Around the 0.2-mile mark, the trail veers closer to the river, with the water on the left side. The majority of the trail is flat and easy, but there are a few rugged areas in this section, so use caution. From there, keep walking on the path as it travels deeper into the oak woods. There are several nice spots to stop and listen to the sound of the river and spot birds. I saw several mallards enjoying the river. I ended up hiking a total of 3 miles — instead of the intended 5 — but the beauty of this hike is that you can turn around at any point. I plan to return to the preserve and try out its other routes in the trail network. Hikers heading back toward the Sandia Creek trailhead. Most sections of the trail are flat and wide, but there are a few narrow sections overlooking the river. (Maura Fox / The San Diego Union-Tribune)