Houston tourist advice

Hello

I’ll be visiting my child who is at college in Houston in a couple of weeks time.

I’m likely to be staying in the medical centre area and will have downtime on my own during the day when she has classes. I have about 5 / 6 days.

I’d like to explore downtown or the museum district. I know Houston isn’t particularly walkable but I would prefer to explore these areas on foot or using the public transit system.

Is this possible or do I just resign myself to having to drive (it’s the wrong side of road for me so I want to limit driving especially in busy areas).

Would you have any recommendations where I can go explore?

Thanks