Here is a brief rundown of whats included in your cruise ticket price and this all varies dependant upon the cruise line you are on. So things like the flow rider are free but only on Royal Caribbean etc.
Room – The stateroom you have selected for example interior, outside with porthole, balcony and suite etc.
Food – Food at the main dining room and buffet and sometimes room service but some lines offer free bbq or pizza 24 hrs.
Pools – All the pools and water slides are free to use also hot tubs.
Shows- There are usually two shows per night in the theatre.
Adults only area – Some free some paid depending upon cruise line.
Activities – Table tennis. Mini Gold, Gymnasium, Running track, Sports Court, Dance Classes, Movies and Trivia etc. SO Much More!!!!!
There are heaps of paid things such as – Cocktail classes, Martini classes, Edge extreme sports, Spa treatments etc.
Theme nights such as formal night where you dress up. White parties and Gatsby Night. Just so many options.
Honestly, you can spend as little as you want or as much as you want. The free activities run all day so you won’t be bored and the food in the dining room and buffet are great. There are speciality restaurants that vary in price it’s all up to you. I personally always use the free activities and free dining options and I have a whale of a time.