River Legacy Park is Arlington’s all-purpose outdoor basecamp, with eight miles of paved hike-and-bike paths and a separate 10-mile mountain-bike network threading through Trinity River bottomland. Runners, walkers, cyclists, and families can move through forest, wetlands, and open greenbelt without leaving the Metroplex. Free trails, picnic areas, overlooks, an exercise station, and easy access to the Living Science Center make this a flexible choice for a quick loop or a longer active day.