For long, quiet, meditative runs, where you get lost in your tunes and lose track of what mile you're on, hit the White Rock Lake trails. Our manmade body of water in East Dallas is ringed by a meandering 9.3-mile trail that winds through woods, over bridges and a dam and past a small marina filled with sailboats. Run, walk or skate the trail alone or join one of many fitness clubs that do the lake in groups (Meetup.com lists a bunch). If 9.3 miles isn't enough of a training workout, the lake trail joins the 7.5-mile White Rock Creek trail at the north end, which makes a near-marathon 24.3-mile round trip.