Definitely use Shirley! I had her do baskets in the totes (drawstring for DS & zip top for DD). Mainly snack foods - chips, some candy bars, etc. Although there is a lot of food onboard you know how teens love to grab that junk food/chip fix.
We also had an underwater camera put in for DS as he planned to snorkel several times and I had several books shipped to Shirley for DD's.
They'll do a great job for you. And hubby can make sure they have something special in there for you too! They managed to totally surprise me even though I'd been on the phone several times as we got very close to cruising time no one spilled the beans about anything else coming but the stuff for the kids!
Deb