Advocate III
One option is to do a quick day camp or overnighter locally. I have a spot in LBJ Grasslands that I've used a few times that is pretty good. There isn't any real trail fun since its pretty flat and just gravel roads, but the scenery is decent in some spots and its quiet. Its also close to DFW so it allows people the flexibility to just come for the day or stay overnight if they want. This might be a good option to get something regular going and then tackle more elaborate group trips.