Thoughts on a phone/wallet case that you can wear around your neck or crossbody? I know I'll always have my phone with me unless I'm going to the whirlpool or the pool. But in those cases I'll bring a small bag anyway for sunscreen, sunglasses, etc.
Other ideas:
* Peak design phone case w/ wallet attachment, you still have to carry the phone. Though bonus is that you can stick the phone on any wall in the ship because it's magnetic
* Small and lightweight packable sling / waist pack