Summer vacations with a 3 month old?

Has anyone in here been to Turner Falls park in OK? 
We are wanting todo a small vacation this summer but baby will only be 3 months when we would go.. Trying to find something that isn't to far away but still fun that wouldn't be to much on her.. We would be renting a cabin if we went and it would be my husnand and I the baby and our 3 year old.
It's only 3 hours from us..
Usually we do a 11 hour drive to Destin FL or 8 hour drive to south padre but figured that would be to much on a 3 month old..