Facelpalm was for not remembering you play FSU every year and played at Miami in 2013.
Denver sucks unless you are there to see music (Red Rocks, etc) or get high. Vegas is Vegas, if that's what you're looking for, then rock out.
As for other options for your trip, ignore anyone trying to get you to go to Lake Tahoe (sorry fellas). Honestly, WTF? It's beautiful, and a great place to visit, but its gotta be 9 hours driving from the U of Utah through the brutal NV wastelands. Non-sensical rec. Save Tahoe for a NoCal trip. Trust me as I've driven from northern NV to the Bay Area before, and I love Tahoe. I mean, you could fly out of SLC into Reno and rent a car and drive and hour if you want more flights in your life, but there are so many incredible nearby places to visit that are just as spectacular (or more) that you can actually get to easier, with drives that are not only shorter but breathtaking, I don't get why you would want to leave the rockies and not explore more while you're there. You could spend years there exploring.
Look into Moab and Zion in Utah for incredible beauty (each 3-4 hrs from SLC or so), Park City/Brighton/Alta (literally 30 min up the mountain from SLC/UU!) for more of a fun vibe with lots to do, or Jackson, WY which would be a life-changing drive and visit, and also is about half as far away as Tahoe.