With cruising, most activities are involved along with food (there are always options to upgrade for an additional fee). The biggest costs associated with cruising come from shore excursions and bar bills. Since there are so many options for things to do in ports this can fluctuate greatly in price. Some things are worth the price tag, others are not. (Again, personal preference) The other cost with cruising is the bar bill. Most people enjoy going on vacation and having a drink or two. If you are the type of person who wants to order 10-20 drinks per day of all different kinds, cruising would definitely not be the best value for your vacation dollar. But if you like the idea of seeing a different port everyday and can keep your bar tab in check, cruising is an excellent value.
All Inclusive vacations offer unlimited drinks and food along with most non-motorized activities. Most of the time it is a bit higher in price per day to go to an all inclusive than to go on a cruise once you factor in airfare but not always. Also with an all inclusive, as with any land vacation, you arrive at one destination and stay there for the duration of your trip. This is not always a bad thing, just depends on what you are looking for in a vacation.
Basically, there is no easy answer. Every situation is different and pricing is always fluctuating. Once you choose between the two, find a price you are c