Racoon River Park is a very nice park. There is a large playground, a fishing pier, dock, beach, softball complex, dog park, soccer field, picnic shelters, nature lodge, and more. The West DesMoines fireworks are held here for independence day. It's an awesome park!
TO TRAILHEAD: trail heads are located near the dog park and near the soccer field / boat dock . But really you could just park anywhere and follow the trail by the water.