Wanted to share what we learned - will also post our experiences in Spain in that forum
1) No museo or restaurant in Potugal has required proof of a Covid test or asked to see our vaccine cards.
2) Mask wearing is very good indoors and on public transportation; some people wear it outdoors but not most.
3) Hand sanitizer is everywhere.
We have felt quite safe in Portugal since they vaccination rates are so high and everyone is careful to mask inside.
The only place, so far, that we have been asked to show proof of vaccination was at a Munich airport duty free shop.
Boarding the Lufthansa flight from Munich to Lisboa was delayed because they don't have a good system in place to check your vaccination results and your passport - just 1-2 harried employees who did not speak English (and therefore had a hard time with the American test results).
Arriving in Lisboa, no one checked anything- we walked through an area with temperature sensors (us and another 20+ people) and purportedly they find anyone with a high temp and take them aside - we did not see anyone detained.