What to do in Houston for a day!

Need some ideas for what to do with one day in Houston in July. My 17 year old daughter will be with me. I have a major adversity to heat and too much walking lol. I had tried to plan Discovery Green for pedal boats and then Phonecia market, and later on POST rooftop for dinner and sunset. Discovery seems more geared towards younger kids and families. And the reviews I just saw on POST weren't very promising. Just want to do something fun and memorable, with photo ops, not too far from Downtown Houston and not more than a few hundred bucks! HELP 🙏❤️