........................ I have three camera systems I can take only one. May I have some comments? ....................
having been to Cuba 9 times in the last two years, each normally 2 weeks, I can give some on the ground insight:
* Cuba is a walking place. It is possible you can be walking 6-8 hours at a time if photographing seriously.
* while Cuba is extremely low crime, property crime against tourists is an issue. Plan on never setting your camera down or leaving it in your hotel room. (casa particulars are seldom the problem that hotels are)
Those mean weight is critical. Do not take more than you can comfortably carry for an extended period. I am a one body, one lens, pocket full of film, no camera bag person so that works for me.
Do take everything you could possibly need with you. Nothing will be available there.
I do carry a redundant camera body and lens (plus batteries and extra film) on every trip. But I only stay in casa particulars, not hotels. I simply tell the family that I am staying with to please look after the photo equipment I leave in the room. I would never leave a camera in a hotel room.
They will want to x-ray your film on arrival and departure. There are no provisions for manual inspections. However, I have always refused to have my film x-rayed in Cuba and managed to talk my way out of it every time. It sometimes is not easy nor quick. I have seen too much "Cuban engineering" (unrelated parts swapping) to trust my film to an x-ray machine maintained by some guy who drives a '48 Chevrolet with a Toyota engine, Ford differential and Plymouth seats.
You mentioned that you were staying "near Trinidad". I am curious where? One of my favorite places to photograph is Banao, a farming community of about 3,000 people between Trinidad and Sancti Spiritus. But I may be the only tourist to have visited there in the modern era.
Be careful of the many overdone cliche photos in Trinidad. The old man sitting on a donkey with a cigar clenched in his teeth (50 cents a photo) has been photographed by almost everyone.