We like to rent cabins in Oklahoma for a nice getaway at Beavers Bend Luxury Cabins. http://beaversbendgetaways.com/
There is a lot to do in oklahoma like going to feed the animals, frontier city, fishing, etc. Sometimes we take the family on a weekend trip there just to get away and sometimes a day trip. Our children are 20 months and 16 yrs old.
Or either we drive down to padre island and rent a condo at Palm Bay Village thru http://lifeisgoodvacationrentals.com/ ; I know its a long drive but we loved it due it was located 3 minutes from the beach.
We use to drive to Louisiana for festivals but there are so many places to go in Texas but traveling within texas seems to take more time than going to oklahoma, louisiana or somewhere else.
I hope you find a nice vacation place for you and your family. That's all the suggestions I have.