We'd like to try and see the kennedy space centre this time as we missed out last time

Is it possible to travel there without a car with a taxi cab or would that be really expensive? If not, how about a bus or coach tour or something like that?

Second question, is it best to buy tickets for these things before we leave or on the day and what are the lunches, tours and so on like? Are they worth doing bearing in mind we only have one day to see everything