I can say if you travel a lot it is damn confusing where and where not you have to mask up. About half the hotels I have been to this week allowed vaccinated to go mask free in public spaces. The other half still required all to be masked in public spaces outside of actively eating/drinking. Some of those I'm pretty sure we're due to municipalities and not necessarily the hotel itself. Others were still the business. We both would by habit walk into hotels with masks on and then if we didn't see mask signs or saw a sign stating the adjusted guidance, would take them off. Restaurants are slower but we found a few this week too not requiring them of guests (though employees were still fully masked up).
Even not traveling it can be a bit confusing in various stores etc.. As you describe, I'm keeping a mask with me and I'm checking to see if there is any signage or anything at the entrance before wearing or not wearing a mask.