Pack a carry-on with everything you need to get through day one before your checked bag arrives. If the thought of your electronics dying makes you have a minor panic attack, make sure that includes an extra charging station -- cabins are notoriously short on outlets. You’ll also want to check 2 things with your cruise line:
1. Dress codes: as in, any requirements more formal than flip-flops and board shorts.
2. BYOB policies: many cruises let you bring champagne onboard, but your rum in a mouthwash bottle isn’t fooling anyone.