I agree, I agree, I agree. Sunset really is a little oasis in the midst of all this Vegasness. It's been around since the dawn of time, so it's foliage is all lush and mature. There are vast expanses of grass, places for BBQs, a pond with a giant tiki-Easter Island-something-like-that stature in the midst of it all where you can go and feed ducks and geese and the occasional swan. All manners of playgrounds and recreational courts dot its expansive acreage.
I've heard tell of people complaining recently of too many people crowding it and playing loud music, etc., and how it's going downhill. As far as I can see, it's one of the most well kept parks around. And if someone's bothering you with their music, I'm sure a polite 'excuse me' would do the trick.
Throughout the year this place is host to events like the Renaissance Faire and the Christmas drive-thru light show as well as a host of others. Pick up a Clark Country Parks and Rec schedule to see what's coming up.