Saldivias is houston's best kept secret. I've literally never ordered anything but he brochettes and never regretted it, just amazing.
There used to be a place called Burger Guys but they didn't bother paying their rent and they got shut down last Christmas. I'm still not over it.
Central Market is just delightful*.
Memorial Park*
Some very good museums in the museum district if you care to culture yourself
*great for people watching