I cannot say enough good things about checking out cruise critic!
If you are allowed on your ship and you plan to bring your own wine also bring a corkscrew, some cruise lines charge upwards of $15 per bottle to uncork the wine for you
Don't bring a ton of stuff, space is very limited. Do bring a few over the counter drugs (tylenol, allergy meds, stomach meds, motion sickness, etc), you can get them on the ship but they are expensive.
DH ordered wine with dinner and our sommelier informed us that they will recork and hold the bottle for as long as it takes you to finish it (not sure if all ships do that but it ended up saving over buying wine by the glass). As for food, if you don't like what you are served they will bring you something else. Don't like the menu options? They will make you something else. Want a 4th serving of steak? they will bring it to you.
On cruise critic you will be able to find the recommended gratuities for your cruise, it seems like a lot but it is well worth it (at least it was on Celebrity, we got not so great service on
DCL). We also tipped our server extra on the first night in addition to his end of cruise envelope, I am sure that helped with the amazing service we received
If you are celebrating anything (birthday, honeymoon, new job) make sure you tell them.
Read the daily activity guide, there is a ton of stuff going on every day!
If you decide not to get off the ship on port days, or for the entire day, the spa usually offers really good deals on port days. I got an hour long hot stone massage for about $40, WAY less than the regular price. This usually isn't advertised so I suggest stopping in the spa on the first day of the cruise and asking if they have specials.
Have a great time, enjoy the food, and don't forget to come back and tell us all about it!