A few ideas before coming here, make sure you have water and make sure you have a camera. This place is bigger than you think!
I love the Springs Preserve. I was lucky enough to see a "show" in the middle amphitheater on birds. Also the museums here give a great visual to how the Vegas valley was made.
I noticed too it has so many activities for kids to do. As a couple that didn't have kids weren't bothered by the kids. Some of the play areas are separate so it wasn't always screaming kids around. The park layout if nice and a fun walk. Plan to be here for a few hours because there's so much to see and do.
Also locals get a good rate so I'll definitely be back.