I assume you are showing your starting point? From that location, SR 68 will be fine. It isn't on the same planet as going through the national park. Your only risks are that it is two lanes and you are at the mercy of the vehicle in front of you. If a scenic drive is your thing, definitely recommend that route. If you are in a time crunch, use the interstate.
Thank you. Decided on 68 on the way up to test and will either do it or interstate on the way back.