My parents are going so they have the money but they give me only like 200 to spend. I never spend that much though I only spend like 60 because I buy strawberry daquiries and my rents, buy the coke card thing so that I can get all the soda I want. It doesn't take that much money.
I only brought about $50 because I'm not really into buying souvenirs or anything. I only spent about $20 overall at the ports for food. On the boat, I used my card to buy a couple drinks throughout the cruise (it was hooked up to my mom's credit card =D) but it amounted to less than $10 so I didn't even have to pay my mom back.
I guess it really depends on what you plan on buying. Some people buy lots of souvenirs and some buy none. Some people buy things like designer purses at ports and others think designer purses are frivilous. Some people buy couple of drinks everyday and some don't. It's all about personal preference.
The things you make me wanna do, I'd rob a Kwik-E Mart for you.