I am very disappointed that vaccinations are not required or even mentioned in the Tour Conditions Agreement:
"Traveling in the wake of the COVID-19 pandemic, we will be careful to maintain high health and safety standards. Tour members agree to follow all safety precautions and health directives set by your guide, by RSE, or by local officials. Examples may include maintaining proper social distancing, the use of face masks (covering your nose and mouth), regular temperature checks, proper handwashing, the use of hand sanitizer, quarantining if you are showing symptoms of COVID-19 or other contagious illness, and/or being seen by a health professional as a condition of continuing on with the tour. The possible precautions and directives required are not limited to the examples included here."
It's near the bottom of https://www.ricksteves.com/tours/tour-conditions
I'm hoping this will change by fall 2022. Otherwise I may need to rethink taking the tour I want and traveling independent instead. Now is too early to decide and to know what Covid is plotting. But if "you are showing symptoms of COVID-19", you just infected the whole tour bus. Yes, I am fully vaccinated. And prefer to be around others who are also vaccinated unless I know them very well.