Just for your awareness, do with it as you will. There is going to be a 'push' encourage mask usage in CR from October 17 - 31. Visitors are most likely to encounter it in transport like taxis and Uber. The back story involves a surge in respiratory illness in Ch*ldren. There have been a lot of cases and schools are closed. It might be good to make sure you have one around when out and about.
Update:
Here is an English language summary:
https://ticotimes.net/2022/10/16/costa- ... -transportThe open question is whether or not it will be enforced in Taxis and Uber. I have received two email notifications from Uber (probably because I am an UberPass subscriber). I plan to carry a mask, but not wear it unless required.