As I mentioned, we were able to go to Schlitterbahn Water Park. We have 4 kids, which I really wasn't sure how this would work as they are all at different ages - and all ages still require a good deal of our attentions. Spoiler alert - it was awesome!
While Schlitterbahn has several locations, we visited the location in San Marcos, TX. We live in Dallas - so it was just a 4 hour drive. Bonus - my husband's family now lives in Austin, TX - so that gave us a place to stay and was nice to visit and catch up with his family.
On the day we visited Schlitterbahn, it was extra hot. We bought the kids swim shoes at Walmart. Swim shoes are a must-have when visiting a water park. I even bought me and the husband a pair. YES, they are ugly - but a must have along with sun screen. We are very pale people and the Texas sun just doesn't like us.
On the day of our visit, we loaded up our picnic, sunscreen and swim shoes and spent the day playing in the water, running after toddlers and enjoying the various slides. I was surprised at how family friendly, Schlitterbahn is. I had a mom help me when my toddler ran. People were kind and the park was clean and a ton of fun.
If you are looking for a fun waterpark vacation idea, definitely check out Schlitterbahn Water Parks!