Ceap outside wedding venues in central texas?

My finance and I are both enlisting in the US Army and would like to be married before we leave for our Basic Training. We would like an outdoor-type venue for a small ceremony with under twenty five guests. We do not have much money to spend on anything extravagant, but if we could have a little something special for not too much, it would really make us happy. If you know of any place that would offer what we are looking for, please let me know. Thank you.