How to get there
Thessaloniki → Halkidiki, step by step
By coach (cheapest): all Halkidiki buses leave from the KTEL Chalkidikis terminal in Pylaia (68 Karakasi St — not the main KTEL Makedonia station!). Reach it with city bus 45A/45B from Egnatia street or a ~€8–12 taxi. Full beach guide: Halkidiki beaches from Thessaloniki. Book online at ktelchalkidikis.gr or call +30 2310 316 555.
From the airport: no direct coach — take bus 79A (or a €15–20 taxi) to the KTEL Chalkidikis terminal first.
By car (most freedom): rentals from ~€30–45/day in summer. Kassandra ~1 h, Nikiti ~1.25 h, Ouranoupoli ~2 h via the new highway. Beaches are spread out, so a car triples what you can see.
Taxi / transfer: €80–120 one way depending on the leg — reasonable split between four.