You've got a ton of options to get to SLC. Fastest: I-80. Most scenic: Take a detour around Lake Tahoe. Drive on the Bonneville Salt Flats. Stop and see the Great Salt Lake. Enjoy the mountains in and around SLC. Utah/Wyoming: Fastest is I-80. Most scenic is Hwy 40 to Vernal, then North on Hwy 191 to Rock Springs. OR take I-15 out of SLC and then wind your way through Logan up to Jackson, WY. See the Tetons and Yellowstone. Head North to I-90. Through Chicago. You can always head North to Hwy 2 and take the "high road" through the UP, Canada (probably closed to US citizens right now) and drop into NH.