The Wetlands is a nice surprise from the hubbub of Vegas glitz and glamour. You can come here just for a nice stroll around the trail or you can listen to the rush of the water at the bridge in the middle of the park.
It's definitely not someplace I'd visit in the heat of summer but in the fall and spring, and even early mornings in the summer, you can enjoy the cool breeze as you take a walk.
If you can get someone to guide you through, your experience would be a lot different than a self tour but either way, a great oasis away from Vegas.