THE HOUSTON MUSEUM OF NATURAL SCIENCE

The natural Science museum was amazing! I can recommend going to Houston for that Museum to everybody who visits San Antonio. I think 2 hours are enough time to see everything, except you have special interest in Dinosaurs, in the preservation of petrified wood or in ancient tribes.
If that's the case, you should plan on staying 3 - 4 hours.

Here you can see our wonderful world from another point of view:

THE WAI WAI TRIBE

 QUARTZ AND OTHER MINERALS

 PETRIFIED WOOD