when you play contests what can you win ?

Other than gambling and Bingo, not a whole lot. My son won the "Survivor" contest. (last challenge was eating dry mealworms!) He won a plastic ship trophy, a Carnival nylon backpack, a Carnival book of paintings, a 1/2 hour in an enviromental massage bubble up in the fitness club and that was about it. We were hoping for some on board credits or something like that!