What do you pack for a 4 day cruise during April?

It depends. Are you going to Alaska or Aruba?

Just pack in a carry on bag......shorts, T.s comfortable shoes, toothbrush, suntan lotion, credit card.....enjoy

Jacket, dress clothes if you are attending dinner (don't forget they will have 1 formal night-evening gowns/church clothes. (That is when they do pictures). Take some pants, swim suite, sleep wear, shorts, shoes, flip flops, maybe slippers, sunglasses/hat, chap stick, your fav. shampoo and condi/soap (usually have it in the showers). It gets chilly at night especially if you have had some sun. I always take nail clippers/nail file, after sunburn/sun screen, something for headaches and stomach. I usually see at least one shower when we were on the island. Look up the weather before you go. On the ship they will announce when they allow people to get of the ship and you can see it on your room.

I assume you are doing an Caribbean cruise since Alaskan or New England cruises don't happen in April. So pack light weight clothing of mostly short sleeve tops, shorts and summer pants. I can't recommend any dresses since I don't even know what sex you are. But certainly one suitcase is enough of clothes f0r a 4 day cruise. Please, next time give us more specifics about yourself and where you are going.

The Antarctic is quite cold in April, so pack warm clothes.

Because you weren't specific, I only assumed that your cruise was to the Antarctic.

Picture what you will sleep in, wear for breakfast, at the pool/beach, on excursions, at lunch, in the gym, at dinner, need for makeup etc. Are there dress codes (formal or informal (like no shorts in the dining room in the evening)).