We are Trail Nuts. We head next week to follow some of the Lewis & Clark/ Pony Express/ Oregon Trails. We'll spend most of our time in Wyoming, the Dakotas, Nebraska, and Kansas, returning to LA via Colorado. Any historic sites that are imperative to see? Any 'don't bothers'? We'll also be taking day hikes. Any warnings re masks in these parts? Needing a taste of freedom after too much time in Commie California. Thanks