We will be going to San Antonio for a conference in mid-September. We plan to arrive early to do some touring around the state. We enjoy birdwatching and plan to do some (along with other activities), but are not so ardent that we keep lifelists or go to a specific location just to catch a glimpse of a rare species. We expect to hit areas such as the Gulf Coast, the Rio Grade Valley, and the Big Bend area. We looking for any specific recommendations for locations to go in early September and also recommendations for any bird watching tours or guides (for just day tours, not specific multi-day trips). Also, which of the Texas birding books would you recommend as there appear to be a few available.