Because of Texas' size it has a very diverse climate and terrain. Texas has plateaus, canyons, plains, hills, and mountains. 90% of Texas is privately owned, so the land can't be explored by its residents. Luckily, Texas does have some great state parks that let you experience all it has to offer.
If you visit any state parks you may encounter a sign letting you know that park hours have changed.. the folks at Sam Houston Jones Park wanted to clarify exactly what is going on with the changes..