Well it depends on what you are looking for. Road cruising around dusk, especially as we get warmer in May and into summer, can be good. Traditional tin flipping in wooded and pasturage areas also works. The most common species in the central part of the state are Texas rats, bull snakes, sometimes prairie or speckled kings. On the venemous side, prime western diamondback habitat can be foind west and southwest of OKC, especially down around Lawton. Copperheads are found almost statewide, cottonmouths in the southwestern quarter of the state, prairie rattlers west and northwest, massasaguas central and east central. Lots and lots of non-venemous watre snakes along creeks and aroind ponds. Might check with the herp people at the OKC Zoo, as they have cniotacts with local herp groups as well. Overall you're in one of a dozen of so states, from Arizona across to Florida, with lots of species and many herping choices.