I booked some excursions through the cruise website like tubing and ziplining (Cozumel, Falmouth Jamaica, Grand Cayman)... is it a safe bet there will be trusty lockers there to put up our stuff before tubing and what not? I don't remember the exact name of the excursion sites. Do most of them provide locks or can we bring our own? And are they generally big enough to fit a typical grade school-sized backpack?
-first time cruiser, untrusting, clueless :)