Here are some cool gadgets or little things that can add to your cruise fun.

USB charger.  This handy charger allows you and your entire family to have enough USB ports to charge all your devices.

Anker 40W 5V / 8A 5-Port Family-Sized Desktop Charger for iPhone 6 / 6 Plus, iPad Air 2 / mini 3, Galaxy S7 / S6 / S6 Edge and More 

"Sunscreen" or "Lotion" flasks.  The perfect way to carry a bit 'o booze with you to the beach.

 GoPong Hidden Sunscreen Alcohol Flask, 2-Pack 

GoPong Hidden Lotion Flask, Sneak Alcohol Anywhere, 3-Pack