You shouldn't have a problem depending on the weather getting into one of the water parks. They close one for refurbishment in the winter so you'll probably only have one choice. Just a word of caution, if the weather is cold and very few people wind up in the parks, they will close them early. My roommate was a lifeguard at TL and BB and she would often be home by noon on those hilly days. They will give you a ticket to return another day (or it may be a full refund, I don't remember) but still, it may mess with your plans. Just a word of warning! If the forecast has one day that's going to be warmer than the other, go that day. Have a great trip!!