How hot is the deck?
 

I like to walk around without shoes. Can I do that on the deck or do I need to wear sandals because the decks are too hot?

Those wooden decks can get extremely hot.

That is why they play the song "hot hot hot" in addition to the Macarena

Just what you need....splinters. And then an infection. Think about all the dirt being tracked on board by your fellow cruisers. Who wants to look at your ugly, filthy feet? Wear sandals, flip-flops, sneakers...just wear something. Leave the bare foot walking to your home.

Dirt? Hey doc, I don't think that you have ever cruised, otherwise you would know that there is no dirt on any cruiseship. Maybe dirty things, but not dirt.