It is a great water park! Do not miss out on the accelerators, especially the four person ones (if you are in a group)! I also think the 4 smaller body slides at the bottom of Summit Tower are fun to try, even if they aren't as thrilling as the bigger slides. There are plenty of picnic tables with umbrellas available at no additional cost, mainly next to the wave pool (which is amazing BTW!). I recommend you bring your own food, as it is allowed on site (except alcohol and glassware). If you prefer, there are multiple fast food options available, a sit-down restaurant and a dairy bar. You should buy your ticket online before heading to the water park, so you do not have to wait in line to buy your ticket at the park.
Don't forget sunscreen! (Oh, and your bathing suit.)