Wife and I really enjoyed JW Marriott Hill Country in San Antonio a few years back. Good food, comfortable room and great spa with an adult only pool. May be a little crazy in the summer with families because of the waterpark, we were there in late fall. Also check out Travaasa outside of Austin or if you'd prefer a B&B in the county, Paniolo Ranch or CW Hill Country outside of Boerne. Both B&B have nice grounds to hang out and enjoy the quiet or you can get in Fredericksburg or Boerne quite easily.