This is a tricky question, actually. I was in Cuba (legally)in 2001. The food there is incredibly bland, because spices are very expensive and they are quite poor.
Every meal had either beans and rice, or, sometimes rice and beans.
But, how your friends are going to prepare the food is another question.
My guess is you are looking at alot of starches and the food tends to be heavy. You might get some foods with peppers.
Let us know how it works out.