I agree with the last poster that most crimes are a crime of opportunity. If you left money, jewlery, etc sitting out it is a temptation. I have had great luck with honest employees at the Disney hotels. I have left a tip out on occaision and forgot to leave a note that the money was left there intentionally and it has not been taken (always taken when i leave a note).
Another "trick" that I have used on occasion is to take an empty shampoo/conditioner whatever bottle and rolled up my money or placed my jewlery inside of it. Then just left it packed in my suitcase or a drawer. The things inside certainly aren't locked up or safe, but to the casual thief (crime of opportunity) it seems that it deters them.
Also, you could choose to place cash on your account to your room and then use your room key to charge at restaurants or shops or whatever. Makes life very simple.
Also, if you had something really, really, valuable that you are worried about, I believe that some of the resorts have "house safes" and you could inquire at the front desk about placing items there.
Good Luck,
Brenda