Things to do with parents

My parents are visiting and they don’t live in US. What are some things to do and see in Houston. Ideally, not a lot of walking. We’re new to Houston as well so were hoping for some hints.

Edit- not their first time in US. They would like to know experience nice Christmas markets/lights. They want to see farms, horses—-maybe a nice ranch? Plus just regular things to do. We don’t have kids.