Are there any good places to go for a three day vacation near houston?

I ume when you went to Galveston, you already visited all the Moody Gardens pyramids. The IMAX theaters and thrill rides are great. They have a huge penguin exhibit, a separate fish exhibit which takes you under the water, and a erfly/tropical forest exhibit. Don't do the paddleboat unless you just want a rest. Not worth the time and money.