Update nps_parks.geojson
Update nps_parks.geojson

added Lake Mead
arogi/circuit-web,arogi/network-tsp,arogi/circuit-web,arogi/internal-demos,arogi/internal-demos,arogi/internal-demos,arogi/network-tsp,arogi/circuit-web,arogi/network-tsp,arogi/network-tsp,arogi/internal-demos