This is something I've always avoided. I keep my money...never too much...deep in my pants pocket, not in a wallet; my cards and passport are elsewhere.
However, everywhere I turn, I see recommendations to use a money belt or hidden wallet in Cuba since it is so much a cash and not a card economy.
I'm still not comfortable with the implications of the advice...but I would like advice on products. So far, what I've seen is mostly either belts with zippered compartments (I guess you have to unbelt to use it?) and hidden pockets or pouches to go inside clothes. I'd appreciate hearing people's experience with either type, and or some other recommendations!