Help,were coming to America.

Laura and I will be riding into the good old U S of A on July 12th or 13th entering near Cardston on route 89. Our over all plan is to ride the sun road and then stay on the Northern leg through Idaho and Washington State. We are looking for help with roads to ride with the best scenery, history etc. It could be Lakes with beaches,Ghost towns or any thing you have found interesting. We have 2 weeks to get home so deviating off the chosen path would not be a problem. Thank you all for any suggestions. Ben