Me and my gf went on a Saturday to check out Bonham state park.  The park attendent was amazing and really freindly, and he gave us a trail map.  Once we were on the trails they became pretty confusing, and branched out in many directions with very few markings and signs that werent very acurate.  We eventually found our way back around to the lake, and walked the entire lake loop, where we did spot a Bald Eagle (I do have pics).  Other than that, we saw very little wildlife, but it was winter.  Overall, the hike was great for walking, and next time we might bring the bikes out.  This is a great place to take a family for a weekend camp/hiking trip close to the Dallas area, yet still far enough away from the city to enjoy nature.