No, I've travelled to Mexico and various islands throughout the Caribbean without any issue of thief. When you travel, you can have good time, but also be safe and reasonable about the situation.
I carried locks with me and used them in our suite at Riu. Basically, I would use everything I needed out of my suitcase and placed everything back. As far as makeup, I left the cheap stuff out, but placed my more expensive products in my suitcase. I also did not use the in-room hotel safe. I locked my rings, watches, and any other valuables (i.e., travel documents, wallet, cash, credit cards, etc.)in my suitcase too.
Yes, you can read the reviews on tripadvisor. You must also read them with a grain of salt.