I'm a Summerlin resident and I take my dog to Trails park daily. I used to live in the Lakes before, and although fitness trail around the lake was fun and picturesque, Trails park is way better! This park has 4 playground/green lawn zones which are connected by the main trail. You can walk, ride a bike, etc - trail is wide enough to fit everyone. Landscaping boasts various trees, shrubs and cacti which bloom one after another, so you always see a spot of color regardless of the month. It's almost like Springs Preserve! A lot of residents hang here daily with their dogs and we let our pups have a play date. I've met the sweetest and friendliest people in Vegas on my walks here.
I haven't tried the pool yet, but going to do it this week.