45th Birthday in Houston?

I had a fantastic plan for my husband's birthday but now he is having some health problems. We are waiting on a scan and a diagnosis and he is very worried that he has cancer. So, I'm not so sure that we should spend as much money or that we should go is far out of town. I'm thinking maybe we should just stay local.

I am now left with only two weeks to plan. His birthday is 1/4.

He likes art, space, airplanes, and baseball. We've already been to all of the airplane museums.

Any ideas?