Also one day is not enough to visit all monestary and then drive back to Thessaloniki .I don’t recommend seeing all the monastery in one day . go early in the morning depending on the ones you visit they are not long to walk up some are very quick from main Entrance. My family is from there and we go every year to see them.
https://divanimeteorahotel.com/?utm_source=google&utm_medium=organic&utm_campaign=gmb this hotel in Kalambaka looks amazing!!!Look for
Look for hotels in Kalambaka, it's a xorio at the base. You can also find airbnb's there.