May is when the sun truly starts to shine in Thessaloniki so if you are heading out, be sure to grab your sun creams. Daily high temperatures can go up to 24 degrees Celsius and with an average of 18 degrees every day all day is a great opportunity for fun under the sun!
Every year in May, Thessaloniki's water park, known as Waterland opens its doors to the public and stays open throughout the summer. There are several free buses each day, starting from outside the railroad station, which can get you to Waterland in mere twenty minutes. A whole day pass there costs 13.5 (10 for children and free for toddlers 0-4) and guarantees a full day of fun in Waterpark's numerous pools, water slides and watersport activites.
A great place to stay to both enjoy Waterland and have quick access to the sea itself is the Golden Star Hotel which is located in the beautiful suburbs or Perea. You can comfortably walk to the beach for a swim in Perea's pristine beaches and enjoy the fine hospitality of the good people of Perea.
Returning to the city itself, you should do well to pay a visit to one of Greece's most famous pastry and confectionary shop; Chatzis. Chatzis has been in operation since 1908, when Thessaloniki was not even under Greek ruleand has been continuously serving prime quality sweets, renowned across the Balkans for more than a century. The legendary Chatzis serves the tastes of old Byzantium and their sweet masterpieces include syrup cakes, mastic dishes, hanoum boureks, all kinds of Turkey-meets-Greece sweets and baklava like you've never tasted before! You can find multiple Chatzis shops across the city, including the center of the city, near the port, in the outskirts and in Kalamaria. Most Chatzis shops are also quality cafeterias of their own right and you can enjoy their hospitality even if you are not in the mood for tasting the best quality sweets in Thessaloniki.