How much cash do you take with you?

My wife and I will be cruising in less than 2 weeks on the Carnival Inspiration which is a 5 day cruise out of Tampa. We were thinking a $1000 should be enough for our excursions, shopping, drinks, light gambling, tips, and parking. We thought a budget would be smart but still want to have a great time. Its my second cruise and my wife's first. My cruise was a long time ago and was only a 3 day tease! What do you guys think?