Crave Cupcakes - fresh cupcakes every hour and a different menu of flavors everyday; as in today there will be coconut cupcakes available but tomorrow there won't be. There are two locations, but the one I've been to is on Kirby Dr near Rice Village.
Even long time Houston residents might not know about the Second Saturday Buffalo Bayou Pontoon Boat rides... Spend a half hour cruising the bayou for 7-bucks for adults, and 5-bucks per child. Held every second Saturday between 10 am-2 pm, first come, first serve. Ask about their evening Bat Colony Pontoon Boat rides, too! They run about 35 bucks per person, but it's so cool...
The Texas Medical Center has 14 hospitals, 49 different treatment centers, 2 med schools, colleges, hotels, helicopters, a police force, 160,000 patient appts. every day, and more than 93,000 employees.
Brazos State Park is near Houston and a great place to go camping, hiking, and bird-watching. Beware of the alligators if you decide to go boating. For those who want to do a little "glamping" there are mini-cabins. My family and I had a blast there.