We are visiting our son in Austin in February and would like to extend our visit to Texas a few days longer. We just don't know where we should go. We will go overnight to San Antonio and had thought about Dallas after that. But I heard that there is not enough to do in Dallas as a visitor other than the Kennedy Memorial. I thought about Houston but other than the space center, I don't know what else there is. It seems as though it would be too cool to enjoy Galveston. Any suggestions. We'll have 2 days to spend wherever we go.