Our personal favorites are the Natural History Museum of Utah, featuring Native American history in Utah and especially the Rock Art from hundreds, if not thousands of years ago. Beautiful visitor center which also has hiking trails. They are open late on Wednesdays. Mount Nebo Scenic Drive south of Provo. This is an all-day activity, so stop frequently to take in the sights. American Fork Canyon's Alpine Scenic Loop: Fantastic! Your NPS Annual Pass will get you in here. Take the Lehi exit, then head East to the entry gate. If you don't have reservations, don't even think of trying to get a camping spot there! Being so close to a major metropolitan area, very busy on weekends. You will also go by Timpanogos Cave National Monument. Haven't taken the hike and tour yet so can't say how good it is. All I know is, it is constantly busy there and parking is very limited and at a premium, so plan accordingly. At the very top of the Scenic Byway, visit Cascade Springs which is a spring with a short hiking loop and trout that you can see in the pools (no fishing allowed). You might want to continue into Heber City but be advised that a lot of the way there is on dirt. Once in Heber, you can continue into Park City and see the Olympic Park that was built for the 2002 Olympics. Return to SLC by getting on I-80 and heading West. Another attraction is the Kennecott Open Pit Copper Mine to the West of SLC. Also, if you are staying at the KOA in SLC, right before you get to it, there is a Mexican restaurant called The Red Iguana. Haven't eaten there yet but, man, there is ALWAYS a line out the sidewalk to get in. We keep saying we're going to try it out some time. I think Guy Fieri put it on the map.
If you are going to be in SLC latter part of the summer, we in Idaho Falls will be directly in the path of the Total Eclipse on Aug. 21.
PM me if you have any other questions.