Clark County Wetlands Park is an awesome sight in the desert, plus it's free. As of April 2012, there is still construction taking place on the far side of the park, but hopefully it'll be awesome when it's all done. You'll find primary paths (concrete) and secondary paths (dirt). Nice marshes and ponds in the area, and even saw a jackrabbit. Overall, it's a great place to be alone with the animals and plants, but would recommend you bring water, sunscreen, and a hat especially on hot days.