Hi Squiggles.
As the other recent posts in this forum have said, there don't appear to be any cruise ships stopping at Trinidad and Tobago right now. I know Royal Caribbean starts in November, so hopefully we will start to see some feedback then.
I know it's frustrating at this point. I have also tried to ask questions on the T*Advisor forum, but get no answers or oddly short answers when I ask about safety or about things to do. Our cruise stops at Trinidad during Carnival, which sounds great, but when I asked about suggestions for where we could hang out to see parade/costumes, all I got was "Queens Savannah Park" (which is specifically spelled out in the State Department warning as a place to avoid!). It kind of leads me to think that maybe locals know they've got a serious crime problem, but don't want to "trash" their island on the forum. Most posts do say that Tobago is considered safer...