A fun fact: The Agia Triada or Holy Trinity monastery was used in the final scenes of the James Bond film For Your Eyes Only- the 12th spy film in the James Bond series (1981, Roger Moore, Inflation Adjusted Total Box Office $463,219,801). wiki/For_Your_Eyes_Only_.
Camping/Beach/Outdoor Gear: Bond, Columbo's team and Melina break into a mountaintop monastery, St. Cyril's, being used by Kristatos to meet Gogol where he will turn over the ATAC. Bond climbs up the sheer face of the mountain and, upon reaching the top, gains control of the lift basket and brings the rest of the team up.
Bond eventually retrieves the ATAC system and talks Melina out of killing Kristatos after he surrenders. Kristatos tries to kill Bond with a hidden weapon, but Columbo throws a knife at him from behind and kills him. KGB chief General Gogol arrives by helicopter to collect the ATAC, but Bond throws it over the cliff (it is dashed to pieces on the rocks below), with the quip, "That's détente, comrade. You don't have it; I don't have it."
Miscellaneous: So my advise; watch the film one more time before visiting Meteora or have a look at the following video-clips on YouTube:
For Your Eyes Only - St. Cyril's Monastery 1.25 Part 1
For Your Eyes Only - St. Cyril's Monastery Part 2
For Your Eyes Only - St. Cyril's Monastery Part 3
For Your Eyes Only - St. Cyril's Monastery Part 4
For Your Eyes Only - St. Cyril's Monastery Part 5
Clothes, this is important. Appropriate clothing is required to visit the monasteries. Take something with you what will cover your shoulders and legs. It doesn't mater what but...
Miscellaneous: There's nothing to eat up there. Bring some sandwiches with you but don't eat them in monasteries' courts.
Luggage and bags:
Brink a small daypack, to put in water, a camera and a skirt if you're a girl, so you could put it on before you enter and take it off when you get out of the monastaries.
Clothing/Shoes/Weather Gear: Comfortable clothing, and once again a skirt if you're a lady and long pants if you're a man and no bare shoulders.
Photo Equipment: yes bring a camera but don't expect to be able to take pictures of everything inside, it's like a museum. Not everything can be photographed.
Luggage and bags:
Located at the fertile plain of Thessaly in central Greece, modern Trikala is the Homeric Trikki. According to tradition Trikki was the daughter of Pinios. It was also believed that Trikala was the birthplace of Aesculapius, which explains the existence of the oldest sanctuary to the physician-god, the ruins of which are southwest of the town. This was a kind of medical center, from which the worship of Aesculapius gradually spread. Crowned by its Byzantine castle (The Fortress), at the top of a wooded hill, built on the site of the ancient Acropolis, the picturesque city of Trikala lies on St. Nicholas Heights, by Litheos river, and is divided into two by an old aqueduct. The castle, which is not far from the temple of Aesculapius, was built in Byzantine times on Hellenistic ruins, and underwent many changes under Ottoman rule. From the Hill of Profitis Elias one has a marvelous view of the valley below studded with big and small villages, the river cutting patterns among them. The churches of Agios Demetrios and Agii Anargyri complete the Byzantine flavor of the town.
Women should wear floor-lenght skirts or dresses. They should also cover their shoulders.
Men should wear long trousers.