Where is the best nightlife in St. Maarten?

Simpson Bay is the Dutch-side hub for bars and clubs, Maho has famous beach clubs and casinos, and the French
side leans toward lounges and live music

Yes — the Dutch side has around a dozen casinos, mostly in Simpson Bay, Maho and Philipsburg, many open late
with shows and dining.

Beach clubs run day-to-night, bars fill from happy hour (~5–7pm), and clubs get busy after 11pm — especially on
weekends.