Meteora was such an interesting place and I recommend you take a day trip if you have the time. It is a series of monasteries that were built on some crazy rock formations & kudos to the monks back then who built these extraordinary buildings without modern machinery. The train ride was pretty easy for the most part from Thessaloniki train station but there was a transfer and the ticket is only written in Greek so my suggestion is you ask how many stops it is to the station where you will have to transfer and if they can write the name of the station in Roman letters. Bring some snacks, water or a sandwich for the ride because the offerings at the transfer station are very bleh. Once you get up to Meteora the guide met me at the station with my name written on a sign. He took us in the minivan to a snack shop before the tour but once again not the best selection of food. The guide was informed and spoke good English. His name was Bill so if you're lucky you will get him as a guide.