The lines depend on mostly the weather. If the weather is nice, the lines will be longer in general because most people who go from nearby have season passes and choose to go when the weather is nice. If it is too hot, the water park, will of course, be decently crowded. This being said, the park, for the most part, has short line times beside lightning run and probably Storm Chaser when it opens. I would recommend going to the coasters first thing when you arrive and then go through everything else. Most of the flat rides never have over a 15-minute wait so none should be an issue at any time throughout the day. Another good idea is to ride the dry rides in the middle of the day when everyone is at the water park. The water park closes early so most try to get it done then come back to finish the dry area afterwards.