What are some of your favorite places in/near Houston to take visitors to?

Hi!

I know there are plenty of articles, YT videos, and other sources of recommendations, but I wanted to see some of the favorites here.

My MIL and wife's SIL are flying in from out of the country (SIL's first time in the US). MIL will be here for a few months and SIL will be here for only a couple weeks (From S.Korea).

I have lived here (Katy) for about 2 years but haven't explored around Houston area as much as I would've liked.
Here are some places I have either been to or thought of taking them.
1. Hermann/Memorial Park
2. Galleria Mall/GDH Waterfall Park
3. Museum District
4. Galveston (Don't really know specific areas of focus though)
5. NASA??? (Don't know if they'd be interested TBH)
6. Maybe we'll take a 2 day trip to SA or Austin

Thank you!