Can't answer for OKW. While Boardwalk doesn't have "trails", there is a .8 mile loop around crescent lake - the walkway from BW,YC, and BC.
There is also a .75 mile path along the waterway from BW to MGM. The bottom line is that there are numerous options to get a 1 miler or a 5 miler in. At one point, the community house over by the quiet pool at the Boardwalk had a small map which depicted the mileage for various run options. It's relatively flat, always scenic and fun! Hard to believe that we have to run after walking the parks all day or vice-versa! Good luck and have fun!