Whoa! That's a really cool idea! I have zero clue on anything related to that though, and I wouldn't even know where to start. I do know that whenever I go into the cave, it's really nice and cool in there. Even when it's scorching hot outside.I like Option 2 with a concrete driveway to it. Gives you plenty of room next to the house for the family to hang out and play.
Have you looked at using the cave for air conditioning and heating? I've long wanted to use a geothermal approach to cool the garage in the summer and heat it in the winter. I used to live in South Florida and wrenching in the garage in the summer was a bit on the warm side and I figure Texas is similar.
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