About 10 miles outside New Braunfels is Lazy L&L campground. About 30 winter texans stayed there last winter. Many deer are present daily and area is rural. Very pretty drive to New Braunfels, along River Rd. Difference of Texas Hill country vs. Valley, is night and day. Yes, Valley is the winter texans mecca and as such offers very large campgrounds with many activities. Hill country is scenic and full of wildlife.
Just to add to what Wolfe 10 said, winter fronts will come through and usually gone in 2-3 days. Most days will have a high around 60-65 degrees with some up near 80. One must understand that winter to us is more like fall time to those from northern states. I live in Houston area so I welcome the winter very much. Just need to point out that liking winter does not include a winter of snow and freezing temps.lol
If trout fishing appeals the Guadalupe River is available to entertain throughout the winter. This is the most southern river in the U.S. for trout fishing.