My 5-year-old *adores* giraffes. Her favorite color is purple, and so she's delighted that giraffe tongues are purple. I don't think she'd mind too much being licked.
I'm hoping to take her to the Baltimore Zoo sometime, as their website says they have giraffes and you can actually feed them (the National Zoo is, sadly, bereft of giraffes, at least according to their website).
We once went to a petting zoo type of thing that had giraffes. There was a giraffe that was in a pen near a camel. They were huge pens, but the unfortunate camel was standing a bit too close to the side of his pen that bordered the giraffe. He'd pick up a nice huge mouthful of whatever (leaves? hay? I forget) and start to munch on it, and the giraffe would lean over the pen with his looooong neck, stick out his loooooong tongue, and scoop half of the food right out of the poor camel's mouth! It was truly hilarious. Camel didn't seem to notice/care.