What to Actually Try
Piyaz (a white-bean salad specific to Antalya), Antalya-style tandir kebab, and fresh Mediterranean seafood are regional specialties worth seeking out specifically — not just generic "Turkish food" you could find anywhere in the country.
Kaleici for a Proper Meal Out
Antalya's old town has the highest concentration of restaurants with actual character rather than tourist-menu repetition, especially around the harbor — worth the trip even from Lara or Konyaalti for a dedicated dinner out.
Eating in the Resort Districts
Belek, Side, Kemer and Alanya each have their own restaurant strips outside the hotel zones, generally more affordable and more locally-oriented the further you get from the main tourist walkway. Side's old town and Alanya's harbor area are the strongest options for this outside Antalya city itself.
A Practical Note on Prices
Restaurants directly on the busiest tourist strips price noticeably higher than those even one or two streets back — walking a short distance further is a reliable way to eat better for less.
The buffet will feed you every day of the trip, but at least one meal in Kaleici or a district's local restaurant strip is worth the detour for anyone who wants more than an all-inclusive-only picture of Antalya.