Using my iPhone 5 abroad without extra charge?

So basically I'm going on holiday soon to Spain for two weeks. I recently got an iPhone 5, which I want to take with me, mainly for the camera but also for music. But obviously I don't want to get heavily charged - As this has happened before with previous phones. I'm just wondering if I keep my phone on Air plane mode for the whole holiday, will that stop me from being able to receive texts/phone calls, and from being able to use the Internet? If so, does this mean I can't get charged any extra? Also, the villa I'm going to be staying in has FREE Wi-Fi, can I connect to Wi-Fi while on Air plane mode? When at the Villa, and iMessage my boyfriend who also has an iPhone 5, as this is done through Wi-Fi, so they won't be any extra charge will there?

Airplane mode blocks Wi-Fi. You need to set up a divert so all calls go to voicemail, and set up a message asking people to text you if urgent. Texts are free to receive. Don't use the phone to make any calls, and don't answer any when abroad. Turn off 3G/data service (IMPORTANT) and use the free Wi-Fi for internet. A bit restrictive, but no sudden charges.

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