Linn, the best systems to listen to, in my estimation, would be UCAN Salt Lake County site 03, UCAN Davis County site 02, Salt Lake City Public Safety (AC33), and the Salt Lake Airport Authority. These are all trunked Moto II SmartZone systems. Unless you are into run of the mill government housekeeping like garbage collection, building engineers, street workers, and the like, I would not bother with the Salt Lake City Services system or Salt Lake County Public Works. The system listed as Salt Lake County Public Safety is a duplicate and better covered by the UCAN site 03 I listed above.
The radio traffic I pick up on the trunked Salt Lake Airport Authority is mostly housekeeping also. Calls for battery jumps, locations of shuttle vans, runway workers, found luggage, janitorial and general repair in the facility. Although occasionally the police, fire, or medical may respond to one thing or another.
These VHF frequencies for air traffic might offer better listening for the airport itself.
You should get very good reception, depending on your physical surroundings, from the airport. I am not into HAM so I cannot give you any information on that account.
I hope you have a safe trip.