How much would all this be in a cruise?

im thinking about going in a carnival cruise to the caribean with my mom or grandma for my birthday my question is how much wuold it be to like go to the gym get a facial drink like a pina colada and what activites do they have in each stop and how much are they the cruise name is carnival imagination how much is a mage and what other things do they charge you extra and what is the best webpage to buy a ticket thankx