You can try flipping rotten pieces of wood, bark, etc. Creeks can be good places to look, but you might not find your target species. Most likely you would get a lot of Nerodia. You can try road cruising at night. Just drive roads through the area and watch for snakes crossing. I normally have good luck just after nightfall, but depending on the area, temps, weather, you can sometimes find snakes all night.
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Andy Maddox
AIM: thekingofproduct
MSN: Poloboy32486@hotmail.com
Yahoo:surfandskimtx04
Houston Herp Key
The Reptizone