What makes the perfect run? A beautiful course that's free of cars, rabid dogs, and bicycles is a good start. A great, ever-changing view helps, as do plenty of friendly fellow runners and walkers. Throw in good lighting for evening runs and a forgivable surface that's easy on the knees. There's at least one route that matches all of those dreams: the Miami Beach boardwalk from 23rd to 46th streets. This stretch of wooden walkway is elevated above the shoreline, allowing the ocean winds to cool even the hottest summer run. There's also an ever-changing view of bathing beauties, kite surfers, power walkers, artists, crazy people, and every other walk of life sharing the beach scene. Run the entire route and back for a solid four-miler. Bonus: When you're finished, you're close to about a million places to celebrate with a cold beer.