We recently visited H2Obx, and I have to say I am so, so excited to share that it is the most family friendly water park I've taken my kids to. I know it is a small thing, but I hate paying to park, and H2Obx not only has free parking, but it is a super short walk to the entrance. The whole park is themed around the Outer Banks, with rides like Wild Horse Run and Queen Anne's Revenge and pirate ships to climb. 
We opted to go on a cloudy day, and there was no crowd. We easily found seats under the largest umbrella I've ever seen for our entire party. We set our stuff at Sand Pail Beach, where we left it all day. The park is easily walkable. Here there are slides for babies and children, water features to play in, and even swings. Some of the rides we could go down together which was great for kids like little R who have never been to a water park before. 
From there we headed to Calico Jack's Cove, a water playground with buckets dumping water, water cannons, geysers, nets to climb up and slides to splash down. Calico Jack's sits right behind Twin Tides, a smaller version of Cat 5, H2Obx's wave pool. Lifejackets are required for kids, but provided. 
We eventually found our way to Deep Six Adventure Lagoon, obstacle courses that RT was able to do without issues, but we hilariously struggled on. There are three challenges, the Lilly Pads, a floating course, and a rock climbing through a waterfall wall. From there head to Teach's Tides Adventure River, over 1,000 feet of lazy river with two entrances and exits. 
Our group of five had lunch for around $40.00. That included a beer from the park, which was particularly familiar. Our own local O'connors brews a lager specifically for the park. Ask for an H2OBX four sure to snag one. Food is not allowed in the park, but they do allow reentry. We were particularly thankful for this during nap time when one person took little R home while the rest of us stayed. There are lots of showers and lockers. Each guest can bring in one unopened bottle of water or an empty reusable water bottle to be filled up inside the park. Another option is to grab a refillable mug for $9.99, with $.99 refills.  This can be used all season. 
We took a risk going on a cloudy day, but there is a policy in place. If the park has to close for 90 minutes, guests are issued a return visit voucher. Guests can rent a cabana, which were beautiful and some even had a t.v. Ages 2 and under are free. For a single day ticket, under 42 inches is $26.99, and over 42" is $36.99. Not bad for 10:00 -6:00. There is a discount for seniors and military, and twilight passes for just the afternoon. If you're going to be in the OBX for a while, the 8 day Vacation Pass for $39.99 might be your best option, or buy a family 4 pack for $29.99 each. Best of all, use code Toddlin for a discount!