In Trinidad & Tobago culture it's a good idea to greet a stranger before asking him or her a question. It's a better idea to avoid strangers when not in the company of others. There is no nude or topless bathing anywhere in Trinidad and Tobago.
Many Trinbagonians like to discuss sports. Being a former British colony, these discussions usually centre around football(soccer) and cricket.
In Trinidad and Tobago, many of the world's great religions are well represented. Christianity, Islam, Hinduism, Buddhism and Bah'ai are popular. Judaism is not very popular and is practised mostly among expatriates.
Atheism and agnosticism are not widespread although many people will hold agnostic beliefs without being openly agnostic.
Although Trinidad has a large Indian Hindu community, there are no taboos that Westerners would have a difficult time getting used to. The cow is not so sacred as to prohibit eating beef or wearing leather although Hindus do not eat beef. (A few ultra-conservative Hindus may take exception to all this, but they are very, very few in number.)
Trinidadians can be extremely friendly and hospitable - especially with guests who share a common religion with them. Be sure to bring small gifts to show your appreciation, as some visitors who had no intention of visiting or staying with locals end up doing so anyway.
Some homes (including a few guest houses) in rural areas are not connected to any underground water mains. However, they may still have running water from a large, round, black outdoor water tank.
If staying in such a place, be sure to conserve water especially in the dry season (or year-round if it doesn't collect rainwater from the roof). If the tanks run dry, water trucks for refills may be available. However, even underground piped water may be rationed during the dry season. In short, if you are not staying in a major hotel, ask about the water situation.