Where are you staying on the island? If the Dutch side near the airport, you will have various areas to explore such as Simpson Bay (Pelican area) that has a casino (Hollywood) and piano Bar (Red Piano) plus many restaurants with live music, Maho that has a few nightclubs (Bliss and the new club above the Casino Royale), casino (Casino Royale), piano bar (Sopranos) and plenty of restaurants, and
Forum:
The Friendly St.Martin Island Forum