Flutterbies
This gigantic terrarium is a psychedelic butterfly experience. Totally worth the trip for people of any age... babies, toddlers, kids, teens, adults, seniors. Admission is a mere $8 ($7 for seniors and kids) and you can stay as long as you like. Restful benches, scenic walkways, a gorgeous waterfall, insect collections, and LOTS of butterflies make this an all-day adventure. And then of course there's the Houston Museum of Natural Science.
There are a couple of fast food options in the museum, but skip them and visit great little taco shop called Bodegas right down the street.
Go. You'll be glad you did.