Hands down the best gym in Las Vegas. I started going here as a student, then as a staff member, now as an alumni (thanks to Scarlet and Gray credits). The gym is beautiful, clean, state of the art and (best of all) never crowded. Some of my favorite areas are the cardio room with elliptical trainers and treadmills, the 2nd floor weight training circuit machines and the pool (which also has a really nice sauna).
Everyone from students to faculty avail themselves of the facilities, so you don't feel too out of place if you're older, like me. Oddly, for being on a college campus, it doesn't seem to have a meat-market kind of feel at all.
Parking can be a problem on campus - but I usually pay $1.00 at the fee box for an hour at the parking garage behind the gym. I've never had a problem finding a space there after 5 pm. Plus you can watch some gorgeous sunsets that silhouette the Strip from the roof.