There is only one main airport in SLC (https://www.slcairport.com/). It is a major Delta Hub and an easy airport to navigate.
Salt Lake City is not an easy city to navigate without a car. Uber & Lyft cars are abundant however it is more cost effective to rent a car via Hotwire. Your daily car rental rate would probably be cheaper than one Uber trip from the airport to the hotel.
Utah has 5 major National Parks - Arches, Bryce Canyon, Canyonlands, Capitol Reef, and Zion. They are all breathtaking.
Please wear whatever formal wear you are comfortable in.
NO.