We went to the parks that exact time last year. When we arrived it was quite chilly (50s at night, 60s during the day), and while the pools and water parks are heated, it was quite frigid to get out and dry off. Later in the week, it was better (solid 70s during the day and much less wind). The water was nice and the bright sun made it more appealing. That time of year is hit or miss though. Good luck. I am sure at least one of the two will be open. I think after March 1 they will both be open so you might have better luck during the latter half of your stay.