How to stop an iPhone from looking for signal?

I'm going on a cruise to Bermuda in a week and i really want to bring my iPhone 4s so i can listen to music, take pictures etc. But i'm worried that i will get calls and texts while i'm there. It will cost a lot of money if i do get them, so how do i avoid it? I want my phone to not roam for signal and to now look for Wi-Fi, since you have to pay for Wi-Fi on the ship. I've never brought my phone to any of my other cruises, so I'm nervous about bringing this one.

Settings>Airplane Mode

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