Ibiza is an island in the Mediterranean Sea off the eastern coast of Spain. It's well known for the lively nightlife in Ibiza Town and Sant Antoni, where major European nightclubs have summer outposts. (Wikipedia)
In summer the cream of the world's DJs (David Guetta, Sven Väth, Armin van Buuren et al) descend on the island, making it the ultimate destination for clubbers. Ibiza's modest population is swallowed whole by the seven-million-odd tourists that arrive en masse each year. (Lonely Planet)
Albufeira is a coastal city in the southern Algarve region of Portugal. It’s a former fishing village that has become a major holiday destination, with sandy beaches and a busy nightlife strip. (Wikipedia)
Being the largest resort town of the Algarve, Albufeira has an extensive range of activities, attractions and hotels, making the town a popular holiday destination for families, couples or groups looking to party.
Albufeira is the largest, liveliest and most energetic of all of the resort towns that line southern Portugal’s beautiful Algarve coastline. (www.algarve-tourist.com)
Hvar is a small ancient bay town on the island with the same name. It is situated in the Croatian Adriatic Sea and, “is estimated to draw around 20,000 people a day in the high season.” “It’s amazing that they can all fit in the small bay town, where 13th-century walls surround beautifully ornamented Gothic palaces and traffic-free marble streets, but fit they do.” (Lonely Planet)
“Visitors wander along the main square, explore the sights on the winding stone streets, swim at the numerous beaches or pop off to the Pakleni Islands to get into their birthday suits – but most of all they come to party. Hvar's reputation as Croatia's premier party town is well deserved.” (Lonely Planet)
Vama Veche (Romania)
Vama Veche is a small village on the Romanian border with Bulgaria on the shore of the Black Sea.
Weekends, as well as, weekdays offer dozens of beach-front bars, clubs and restaurants with 24/7 service. Thousands of people gather on the weekends and party on the beach and there is a free spirit and Bohemian atmosphere created by all! (https://wikitravel.org/en/Vama_Veche)
Vama Veche is the place where ageing hippies and bearded hipsters commingle, let their hair down and bond over beers and beach. This is the place to dance all night and sleep it off on the beach the next day. (Lonely Planet)
Thessaloniki is a Greek port city on the Thermaic Gulf of the Aegean Sea. Evidence of Roman, Byzantine and Ottoman history remains, especially around Ano Poli, the upper town. Much of the city center was destroyed in the Great Fire of 1917. The rebuilt 20th-century city has a modern European layout. (Wikipedia)
Nights in Thessaloniki are an unforgettable experience! The most famous travel magazines and websites discovered one after another the nightlife of the city. In fact, National Geographic included Thessaloniki in the list with the top 10 cities with the best nightlife worldwide. (https://thessaloniki.travel) According to their site
Thessaloniki has more cafés per capita than any other European city.