alcina:
As we sift through choices of family holidays we are finding some questions about cruises. Speicifically, what's included?
It looks to us like included =
*food, food, food - eating at various restuarants, buffets all day and all night
On several of the cruise lines there are "optional" dining rooms that do cost extra, from between $8 and $25 per person. The food is supposed to be a bit better than the regular, free, dining room, and the service is a bit more labour intensive, meaning that there should be less diners per waiter so you get more attention. I have always found the food in the regular dining room to be more than just OK, so I haven't been interested in trying the "special" dining venue.
Other food that is usually included as free is room service. It depends on the cruise line, but on Princess you can order off the dining room menu in addition to what is listed on the room service menu. You have to know in advance what is on the menu during the meal time you want to order from. While the room service food is free, you are generally expected to tip the person who brings the food. The amount of tip would depend on the amount of food ordered.
Also, in addition to the regular dining room(s) for breakfast, lunch, and dinner, and the buffet, which is 24/7 on Princess, there are usually additional places for included food, like a pizza place and a grill somewhere on deck near a pool that offers hamburgers, hot dogs and the like.
alcina:
Not included -
*anything off ship
*any alcohol
*soft drinks except with a meal
Many of the cruise lines no longer include soft drinks at any time, not even at a meal. They want you to buy their soda card/sticker. They are usually just over $20 per person for a 7 day cruise.
The American cruise lines I am familiar try to keep passengers from bringing aboard their own hard alcohol. Some lines are OK with a couple of bottles of wine or a case of beer, others are not. In any case, you can buy the booze on board, either thru room service or the "duty free" shop on the ship. If you do get it from the DF shop, you will have to pay a bit more than the shelf price to be able to take it back to your cabin, or they will store it for you until the last night of the cruise, then deliver it to your cabin. Some people "smuggle" booze aboard ship in their checked luggage which isn't x-rayed. That seems like too much work for me.
If you haven't found it already,
Cruisecritic.com is an excellent cruise message board where you can get answers to questions about specific cruise lines.
Finally, you probably already know this, but diving while on a cruise is more work than staying at a resort/hotel like Caribe Blue. You either have to haul your gear around or use rental stuff

Most people advise to make you own dive arrangements rather than use the ship's more expensive and restrictive dive excursions. It is a fun way to get to dive multiple destinations, but it takes more effort too.
Have a great trip
Bruce