Nicole,
Basically you get together and get to know those that you will be cruising with. You exchange gifts, so you have a little surprise/treat each day from someone. Your gift doesn't have to be much, and anything is appreciated, it is the thought that counts. Sometimes what you do is tempered by how many people there are. Your Fish Extenders are what holds all your surprises.
For our last cruise, I went to Costco and got the bags of trail mix. I put them in some small celophane bags, and I attached a label with my Dis' name and my real name underneath. Several people commented that they loved it because they could throw it in their backpack and eat it on an excursion, or just have a "normal" snack at some point.
Here are a couple I made for our cabins - mind you I'm not a sewer. Someone graciously gave me dimensions, and I figured it out from there from pictures.
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