There are almost none. Life in Poland has come back to normal. Schools, shops, cinemas, theaters, hotels, restaurants and cafes are open. There are no limits on the number of people in cinemas, theaters, museums, at weddings etc.
Starting March 28, 2022, mask wearing is obligatory only in medical facilities and pharmacies. You do not need to wear a mask in closed spaces. The Polish government has lifted all COVID-19 restrictions, including the quarantine/isolation mandate.
Please mind that the COVID-19 restrictions may change over time, so it is best to check them closer to your departure day. A full and up-to-date list of temporary restrictions and limitations can be found here