The 33rd Amazing Thailand Pattaya Marathon 2026 expects 21,727 runners from 58 countries plus ~40,000 total participants (including supporters). Thailand's Tourism Authority estimates 288 million baht in direct and indirect economic impact for Pattaya and Chon Buri Province over the September 26–27 weekend. The event has evolved from a sports competition into a major city festival and annual calendar fixture, driving tourism spending and off-season demand when the tourism sector needs stimulus.