If you booked through a holiday company, the rep is likely to offer excursions throughout your stay.
A MUST DO... is to take a boat tour of the island. There will be a number of stop offs around the island including beaches that you can't access any other way. A lot of the time the 20 people that were on the boat were the only people on these beaches, which range from remote white sands of lalaria to a passing view of the nudist beach, banana (aptly named) and sometimes they even put on a show for you lol.
The trip I took allowed us to explore the ancient city of kastro, and the islet of Tsoungria. I will go more into detail about these in another tip :)
Skiathos Town is delightful with narrow streets alley ways fronted by Greek tavernas and a small harbour where you can catch local water taxis to resorts further down the coast or to the neighbouring islands
One of the most beautiful beaches I have ever seen! Crystal clear water, deep blue, azure, turquoise... Pebbled, with many little coves, rocks, secret passages...
Reachable only by boat! There are daily tours from Skiathos town.
We found that Koukonaries Beach was the best beach. The beach is sandy the water is cyrstal clear and it is safe for children. There are water sports facilitys if you require them and Good food at the Taverna on the Beach.
Meteora, must be seen. These monastery's where built thousands of years ago on the top of the rock pinnacles. It is hard to believe how they where bulit with out the aid of any type of construction equipment. One of the Monastery's the monks that live there get to the top of the monastery by a basket suspended from a rope (not for the faint hearted). Meteora is on the main land and is is quite a journey to get there, first by Boat, then a long journey by bus. It was a long hot day so be prepared.
If you have a Dog and miss your dog whilst you are on holiday. You must visit the Skiathos Dog Shelter. You can take the dogs on walks. Tourist donations keep the shelter running. The shelter is at kounistra and a car is needed to get there.
Horseback riding for a change. That was fantastic. We enjoyed it. The people running the place are very friendly and our kids enjoyed the zoo and donkey-riding.
The road going along the front of Skiathos Town leads to the end of the runway, this closes at the end of the runway as aircraft take-off or land.