sunroom flooring

My daughter and I are having a home built and we are having a sunroom added which the builders are giving to us, however we will have to pay or the flooring. I am trying to decide what kind of flooring to put down. We will have heating and air conditioning put in the sunroom and it will lead to the outside. I want a floor that will withstand my granddaughter coming in from the pool. The expense has already gotten to be a little more than I had anticipated and so I decided to try to do the floor my self. I was looking on the net and found something called cushionstep flooring. I dont know much about with the exception of what I read. I would like to know what kind of flooring is best for my sunroom. Any help you can give will be greatly appreciated.

thank you