Well, the salt flats are probably the most desolate place on earth. Hundreds upon hundreds of square miles of salt. Nothing grows there because of all the salt. Just a huge desert of salt. It's interesting and intriguing in a way, but certainly not much to look at. The Great Salt Lake itself stinks, bad. Get a little wind going and you're in for a real treat. The only thing that lives in the Great Salt Lake is brine shrimp. You could go swimming and get a real kick out of not being able to sink, but then you emerge crusted in salt and smelling like the rotten lake.
The last thing I would recommend going to see if you come to Utah is the Great Salt lake.