If you've never been to a third-world country, the country will be a shock to you. Even the ghettos in America are better. Other than that, you'll have to live with the fact that most of Trinidad is dirty and nasty. That said, there are several sites that are half-decent to visit, including Marracas Bay, parts of Port-of-Spain and this Hindu shrine that is somewhere on the island.
It's a very ugly country, and I can't recommend much of anything for you to see there.
*UPDATE*-To comment to the poster below, I have family there, and I've been to the country twice. I'm actually from Barbados living in America, which is a far better, more beautiful island. Trinidad is just nasty, plain and simple. The people there only want to party, and it's true. I'm not being an idiot. I've seen bodyguards for government ministers at malls carrying assault rifles.
I suppose I don't wanna know why he's carrying so much firepower openly at a mall...